gdb-cross-canadian: not shipping libiberty.

gdb-cross-canadian: not shipping libiberty.

Fixed package QA warnings.

WARNING: QA Issue: non -staticdev package contains static .a library:
gdb-cross-canadian-i586 path
'/work/x86_64-nativesdk-pokysdk-linux/gdb-cross-canadian-i586-7.4-r6.3/packages-split/gdb-cross-canadian-i586/opt/poky/1.1+snapshot/sysroots/x86_64-pokysdk-linux/usr/lib/lib/libiberty.a'

(From OE-Core rev: 231cdeec05f82a8b16141098ca9ca6df41ebe396)

Signed-off-by: Lianhao Lu <lianhao.lu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>