Fixes build failure on Solaris:
gem_seqno_wrap.c: In function ‘run_cmd’:
gem_seqno_wrap.c:328:3: error: implicit declaration of function ‘kill’ [-Werror=implicit-function-declaration]
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>