drm/i915: add extern C guard for the UAPI header

Cc: Jani Nikula <[e-mail]>
Signed-off-by: Emil Velikov <[e-mail]>
Acked-by: Daniel Vetter <[e-mail]>

include/uapi/drm/i915_drm.h

···
 
 #include "drm.h"
 
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
 /* Please note that modifications to all structs defined here are
  * subject to backwards-compatibility constraints.
  */
···
 #define I915_CONTEXT_PARAM_GTT_SIZE	0x3
 	__u64 value;
 };
+
+#if defined(__cplusplus)
+}
+#endif
 
 #endif /* _UAPI_I915_DRM_H_ */