drm/vmwgfx: add extern C guard for the UAPI header

Cc: Thomas Hellstrom <[e-mail]>
Cc: Brian Paul <[e-mail]>
Signed-off-by: Emil Velikov <[e-mail]>
Acked-by: Sinclair Yeh <[e-mail]>

include/uapi/drm/vmwgfx_drm.h

···
 
 #include "drm.h"
 
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
 #define DRM_VMW_MAX_SURFACE_FACES 6
 #define DRM_VMW_MAX_MIP_LEVELS 24
 
···
 	enum drm_vmw_extended_context req;
 	struct drm_vmw_context_arg rep;
 };
+
+#if defined(__cplusplus)
+}
+#endif
+
 #endif