This ports the below libdrm commit to the kernel
commit 
0f4452bb51306024fbf4cbf77d8baab20cefba67
Author: Daniel Kurtz <djkurtz@chromium.org>
Date:   Mon Aug 26 23:39:16 2013 +0800
    libdrm: Make some drm headers compatible with gcc -std=c89 -pedantic
    The following minor changes were needed to these headers:
     * Convert // comments to /* */
     * No , after final member of enum
    With these changes, these header files can be included by a program that
    is built with gcc options:
      -std=c89 -Werror -pedantic
    Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
    Signed-off-by: Eric Anholt <eric@anholt.net>
    Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1459348943-12803-2-git-send-email-daniel.vetter@ffwll.ch
 
        _DRM_SHM = 2,             /**< shared, cached */
        _DRM_AGP = 3,             /**< AGP/GART */
        _DRM_SCATTER_GATHER = 4,  /**< Scatter/gather memory for PCI DMA */
-       _DRM_CONSISTENT = 5,      /**< Consistent memory for PCI DMA */
+       _DRM_CONSISTENT = 5       /**< Consistent memory for PCI DMA */
 };
 
 /**
  * DRM_IOCTL_UPDATE_DRAW ioctl argument type.
  */
 typedef enum {
-       DRM_DRAWABLE_CLIPRECTS,
+       DRM_DRAWABLE_CLIPRECTS
 } drm_drawable_info_type_t;
 
 struct drm_update_draw {