readline: Add a patch to remove the redundant rpath linker option

readline: Add a patch to remove the redundant rpath linker option

This resolves the QA warnings:

WARNING: QA Issue: readline: /work/x86_64-poky-linux/readline-6.2-r0/packages-split/readline/usr/lib/libhistory.so.6.2 contains probably-redundant RPATH /usr/lib
WARNING: QA Issue: readline: /work/x86_64-poky-linux/readline-6.2-r0/packages-split/readline/usr/lib/libreadline.so.6.2 contains probably-redundant RPATH /usr/lib
WARNING: QA Issue: readline: /work/x86_64-poky-linux/readline-6.2-r0/packages-split/readline/usr/lib/libreadline.so.6 contains probably-redundant RPATH /usr/lib
WARNING: QA Issue: readline: /work/x86_64-poky-linux/readline-6.2-r0/packages-split/readline/usr/lib/libhistory.so.6 contains probably-redundant RPATH /usr/lib

(From OE-Core rev: fe8661cd30b02dd8ea9bf172479f372c919c36a7)

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