Update kernel headers with new parser.

Test: Builds.
Change-Id: I3f0714d53ac893ccc3e66f7a92d0ea7a6737f1c3
diff --git a/libc/kernel/uapi/drm/vgem_drm.h b/libc/kernel/uapi/drm/vgem_drm.h
index 7b0ebc9..b33452b 100644
--- a/libc/kernel/uapi/drm/vgem_drm.h
+++ b/libc/kernel/uapi/drm/vgem_drm.h
@@ -20,6 +20,7 @@
 #define _UAPI_VGEM_DRM_H_
 #include "drm.h"
 #ifdef __cplusplus
+extern "C" {
 #endif
 #define DRM_VGEM_FENCE_ATTACH 0x1
 #define DRM_VGEM_FENCE_SIGNAL 0x2
@@ -37,5 +38,6 @@
   __u32 flags;
 };
 #ifdef __cplusplus
+}
 #endif
 #endif