Update kernel headers with new parser.

Test: Builds.
Change-Id: I3f0714d53ac893ccc3e66f7a92d0ea7a6737f1c3
diff --git a/libc/kernel/uapi/drm/drm_sarea.h b/libc/kernel/uapi/drm/drm_sarea.h
index 03317b9..a0c7f3a 100644
--- a/libc/kernel/uapi/drm/drm_sarea.h
+++ b/libc/kernel/uapi/drm/drm_sarea.h
@@ -20,6 +20,7 @@
 #define _DRM_SAREA_H_
 #include "drm.h"
 #ifdef __cplusplus
+extern "C" {
 #endif
 #ifdef __alpha__
 #define SAREA_MAX 0x2000U
@@ -54,5 +55,6 @@
 typedef struct drm_sarea_frame drm_sarea_frame_t;
 typedef struct drm_sarea drm_sarea_t;
 #ifdef __cplusplus
+}
 #endif
 #endif