gthumb: Resolve staticdev QA warnings

gthumb: Resolve staticdev QA warnings

Since the .a files are pretty useless in the case of plugin modules, lets
just remove them. This resolves the warnings:

WARNING: QA Issue: non -staticdev package contains static .a library: gthumb path '/work/x86_64-poky-linux/gthumb-2.12.4-r1/packages-split/gthumb/usr/lib/gthumb/extensions/libslideshow.a'
WARNING: QA Issue: non -staticdev package contains static .a library: gthumb path '/work/x86_64-poky-linux/gthumb-2.12.4-r1/packages-split/gthumb/usr/lib/gthumb/extensions/libimporter.a'
WARNING: QA Issue: non -staticdev package contains static .a library: gthumb path '/work/x86_64-poky-linux/gthumb-2.12.4-r1/packages-split/gthumb/usr/lib/gthumb/extensions/libimage_viewer.a'
WARNING: QA Issue: non -staticdev package contains static .a library: gthumb path '/work/x86_64-poky-linux/gthumb-2.12.4-r1/packages-split/gthumb/usr/lib/gthumb/extensions/libchange_date.a'
WARNING: QA Issue: non -staticdev package contains static .a library: gthumb path '/work/x86_64-poky-linux/gthumb-2.12.4-r1/packages-split/gthumb/usr/lib/gthumb/extensions/libedit_metadata.a'
WARNING: QA Issue: non -staticdev package contains static .a library: gthumb path '/work/x86_64-poky-linux/gthumb-2.12.4-r1/packages-split/gthumb/usr/lib/gthumb/extensions/libgstreamer_tools.a'
WARNING: QA Issue: non -staticdev package contains static .a library: gthumb path '/work/x86_64-poky-linux/gthumb-2.12.4-r1/packages-split/gthumb/usr/lib/gthumb/extensions/libphoto_importer.a'
WARNING: QA Issue: non -staticdev package contains static .a library: gthumb path '/work/x86_64-poky-linux/gthumb-2.12.4-r1/packages-split/gthumb/usr/lib/gthumb/extensions/libimage_rotation.a'
WARNING: QA Issue: non -staticdev package contains static .a library: gthumb path '/work/x86_64-poky-linux/gthumb-2.12.4-r1/packages-split/gthumb/usr/lib/gthumb/extensions/libfile_viewer.a'
WARNING: QA Issue: non -staticdev package contains static .a library: gthumb path '/work/x86_64-poky-linux/gthumb-2.12.4-r1/packages-split/gthumb/usr/lib/gthumb/extensions/libpixbuf_savers.a'
WARNING: QA Issue: non -staticdev package contains static .a library: gthumb path '/work/x86_64-poky-linux/gthumb-2.12.4-r1/packages-split/gthumb/usr/lib/gthumb/extensions/libexport_tools.a'
WARNING: QA Issue: non -staticdev package contains static .a library: gthumb path '/work/x86_64-poky-linux/gthumb-2.12.4-r1/packages-split/gthumb/usr/lib/gthumb/extensions/libconvert_format.a'
WARNING: QA Issue: non -staticdev package contains static .a library: gthumb path '/work/x86_64-poky-linux/gthumb-2.12.4-r1/packages-split/gthumb/usr/lib/gthumb/extensions/librename_series.a'
WARNING: QA Issue: non -staticdev package contains static .a library: gthumb path '/work/x86_64-poky-linux/gthumb-2.12.4-r1/packages-split/gthumb/usr/lib/gthumb/extensions/libfile_tools.a'
WARNING: QA Issue: non -staticdev package contains static .a library: gthumb path '/work/x86_64-poky-linux/gthumb-2.12.4-r1/packages-split/gthumb/usr/lib/gthumb/extensions/libwebalbums.a'
WARNING: QA Issue: non -staticdev package contains static .a library: gthumb path '/work/x86_64-poky-linux/gthumb-2.12.4-r1/packages-split/gthumb/usr/lib/gthumb/extensions/libcatalogs.a'
WARNING: QA Issue: non -staticdev package contains static .a library: gthumb path '/work/x86_64-poky-linux/gthumb-2.12.4-r1/packages-split/gthumb/usr/lib/gthumb/extensions/libresize_images.a'
WARNING: QA Issue: non -staticdev package contains static .a library: gthumb path '/work/x86_64-poky-linux/gthumb-2.12.4-r1/packages-split/gthumb/usr/lib/gthumb/extensions/libimage_print.a'
WARNING: QA Issue: non -staticdev package contains static .a library: gthumb path '/work/x86_64-poky-linux/gthumb-2.12.4-r1/packages-split/gthumb/usr/lib/gthumb/extensions/libdesktop_background.a'
WARNING: QA Issue: non -staticdev package contains static .a library: gthumb path '/work/x86_64-poky-linux/gthumb-2.12.4-r1/packages-split/gthumb/usr/lib/gthumb/extensions/libred_eye_removal.a'
WARNING: QA Issue: non -staticdev package contains static .a library: gthumb path '/work/x86_64-poky-linux/gthumb-2.12.4-r1/packages-split/gthumb/usr/lib/gthumb/extensions/libcomments.a'
WARNING: QA Issue: non -staticdev package contains static .a library: gthumb path '/work/x86_64-poky-linux/gthumb-2.12.4-r1/packages-split/gthumb/usr/lib/gthumb/extensions/libfile_manager.a'
WARNING: QA Issue: non -staticdev package contains static .a library: gthumb path '/work/x86_64-poky-linux/gthumb-2.12.4-r1/packages-split/gthumb/usr/lib/gthumb/extensions/libjpeg_utils.a'
WARNING: QA Issue: non -staticdev package contains static .a library: gthumb path '/work/x86_64-poky-linux/gthumb-2.12.4-r1/packages-split/gthumb/usr/lib/gthumb/extensions/libgstreamer_utils.a'
WARNING: QA Issue: non -staticdev package contains static .a library: gthumb path '/work/x86_64-poky-linux/gthumb-2.12.4-r1/packages-split/gthumb/usr/lib/gthumb/extensions/liblist_tools.a'
WARNING: QA Issue: non -staticdev package contains static .a library: gthumb path '/work/x86_64-poky-linux/gthumb-2.12.4-r1/packages-split/gthumb/usr/lib/gthumb/extensions/libbookmarks.a'
WARNING: QA Issue: non -staticdev package contains static .a library: gthumb path '/work/x86_64-poky-linux/gthumb-2.12.4-r1/packages-split/gthumb/usr/lib/gthumb/extensions/libsearch.a'
WARNING: QA Issue: non -staticdev package contains static .a library: gthumb path '/work/x86_64-poky-linux/gthumb-2.12.4-r1/packages-split/gthumb/usr/lib/gthumb/extensions/libraw_files.a'

(From OE-Core rev: a31d0dbd03b437de9c64a160e86ef97ef7e08807)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>