lib: more unecessary header removal

This time big with media_fill.h

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

lib/igt_core.h

@@ -30,7 +30,10 @@
 #ifndef IGT_CORE_H
 #define IGT_CORE_H
 
+#include <setjmp.h>
 #include <stdbool.h>
+#include <string.h>
+#include <sys/types.h>
 
 bool __igt_fixture(void);
 void __igt_fixture_complete(void);