lib: extract kmstest_dump_mode

lib/drmtest.h

@@ -34,6 +34,7 @@
 #include <cairo.h>
 
 #include "xf86drm.h"
+#include "xf86drmMode.h"
 #include "intel_batchbuffer.h"
 
 int drm_get_card(int master);
@@ -90,6 +91,7 @@ unsigned int kmstest_create_fb(int fd, int width, int height, int bpp,
 			       struct kmstest_fb *fb_info,
 			       kmstest_paint_func paint_func,
 			       void *func_arg);
+void kmstest_dump_mode(drmModeModeInfo *mode);
 
 inline static void _do_or_die(const char *function, int line, int ret)
 {