build: fix gettimeofday warning
build: fix gettimeofday warning

  CC     test_playback.o
test_playback.c: In function ‘playback_timer_cb’:
test_playback.c:56:5: warning: implicit declaration of function ‘gettimeofday’

mathslinux/spice,SPICE/spice,Fantu/spice,elmarco/spice,fgouget/spice,ya-mouse/spice,freedesktop-unofficial-mirror/spice__spice,mathslinux/spice,dezelin/spice,fgouget/spice,Fantu/spice,dezelin/spice,alon/spice-server,freedesktop-unofficial-mirror/spice__spice,mathslinux/spice,dezelin/spice,elmarco/spice,alon/spice-server,ya-mouse/spice,SPICE/spice,mathslinux/spice,Fantu/spice,alon/spice-server,alon/spice-server,SPICE/spice,fgouget/spice,ya-mouse/spice,dezelin/spice,alon/spice-server,freedesktop-unofficial-mirror/spice__spice,elmarco/spice,freedesktop-unofficial-mirror/spice__spice,freedesktop-unofficial-mirror/spice__spice,elmarco/spice,elmarco/spice,Fantu/spice,fgouget/spice,dezelin/spice,mathslinux/spice