Update kernel headers with new parser.

Test: Builds.
Change-Id: I3f0714d53ac893ccc3e66f7a92d0ea7a6737f1c3
diff --git a/libc/kernel/uapi/drm/mga_drm.h b/libc/kernel/uapi/drm/mga_drm.h
index 4d5ad0c..4959502 100644
--- a/libc/kernel/uapi/drm/mga_drm.h
+++ b/libc/kernel/uapi/drm/mga_drm.h
@@ -20,6 +20,7 @@
 #define __MGA_DRM_H__
 #include "drm.h"
 #ifdef __cplusplus
+extern "C" {
 #endif
 #ifndef __MGA_SAREA_DEFINES__
 #define __MGA_SAREA_DEFINES__
@@ -240,5 +241,6 @@
   void __user * value;
 } drm_mga_getparam_t;
 #ifdef __cplusplus
+}
 #endif
 #endif