package/kf5/kf5-kcoreaddons: don't treat ld warnings as errors

package/kf5/kf5-kcoreaddons: don't treat ld warnings as errors

Microblaze ld emits warnings like:
'
FDE encoding in
CMakeFiles/KF5CoreAddons.dir/KF5CoreAddons_autogen/mocs_compilation.cpp.o(.eh_frame)
prevents .eh_frame_hdr table being created
'
Since '-Wl,--fatal-warnings' is passed by default, build fails, so don't
treat warnings as errors by appending "-Wl,--no-fatal-warnings" to
CMAKE_SHARED_LINKER_FLAGS that is previously defined in package
dependency kf5-extra-cmake-modules.

Fixes:
http://autobuild.buildroot.net/results/f19/f198c86930535c50393e17fc7a70fb4f27b096ee/

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>