ptest-runner: libgcc must be installed for pthread_cancel to work

This only affects glibc systems and have been
found on runqemu core-image-minimal with gstreamer ptest-runner

STOP: ptest-runner
libgcc_s.so.1 must be installed for pthread_cancel to work
Aborted

Signed-off-by: Jose Quaresma <quaresma.jose@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 1cb679e6)
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>