mesa: Drop enums that had been removed in later revs of specs.

Mesa hasn't been using these enums and the finalized specs don't reference
them, so losing them from our generated enum-to-string code should be
fine.  Reduces diffs to generating from Khronos XML, which has these enums
noted defined but commented out from any consumers.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

src/mapi/glapi/gen/ARB_direct_state_access.xml

@@ -5,7 +5,6 @@
 <category name="GL_ARB_direct_state_access" number="164">
    <enum name="TEXTURE_TARGET"  value="0x1006"/>
    <enum name="QUERY_TARGET"    value="0x82EA"/>
-   <enum name="TEXTURE_BINDING" value="0x82EB"/>
 
    <!-- Transform Feedback object functions -->
 

src/mapi/glapi/gen/EXT_framebuffer_object.xml

@@ -8,7 +8,6 @@
     <enum name="RENDERBUFFER_WIDTH_EXT"                   value="0x8D42"/>
     <enum name="RENDERBUFFER_HEIGHT_EXT"                  value="0x8D43"/>
     <enum name="RENDERBUFFER_INTERNAL_FORMAT_EXT"         value="0x8D44"/>
-    <enum name="STENCIL_INDEX_EXT"                        value="0x8D45"/>
     <enum name="STENCIL_INDEX1_EXT"                       value="0x8D46"/>
     <enum name="STENCIL_INDEX4_EXT"                       value="0x8D47"/>
     <enum name="STENCIL_INDEX8_EXT"                       value="0x8D48"/>
@@ -52,13 +51,11 @@
     <enum name="FRAMEBUFFER_COMPLETE_EXT"                 value="0x8CD5"/>
     <enum name="FRAMEBUFFER_INCOMPLETE_ATTACHMENT_EXT"    value="0x8CD6"/>
     <enum name="FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT_EXT"   value="0x8CD7"/>
-    <enum name="FRAMEBUFFER_INCOMPLETE_DUPLICATE_ATTACHMENT_EXT" value="0x8CD8"/>
     <enum name="FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT"    value="0x8CD9"/>
     <enum name="FRAMEBUFFER_INCOMPLETE_FORMATS_EXT"       value="0x8CDA"/>
     <enum name="FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER_EXT"   value="0x8CDB"/>
     <enum name="FRAMEBUFFER_INCOMPLETE_READ_BUFFER_EXT"   value="0x8CDC"/>
     <enum name="FRAMEBUFFER_UNSUPPORTED_EXT"              value="0x8CDD"/>
-    <enum name="FRAMEBUFFER_STATUS_ERROR_EXT"             value="0x8CDE"/>
     <enum name="FRAMEBUFFER_BINDING_EXT"        count="1" value="0x8CA6">
         <size name="Get" mode="get"/>
     </enum>

src/mapi/glapi/gen/GL3x.xml

@@ -21,8 +21,6 @@
   <enum name="MINOR_VERSION"                    value="0x821C"/>
   <enum name="NUM_EXTENSIONS"                   value="0x821D"/>
   <enum name="CONTEXT_FLAGS"                    value="0x821E"/>
-  <enum name="DEPTH_BUFFER"                     value="0x8223"/>
-  <enum name="STENCIL_BUFFER"                   value="0x8224"/>
   <enum name="CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT"  value="0x0001"/>
   <enum name="RGBA32F"                          value="0x8814"/>
   <enum name="RGB32F"                           value="0x8815"/>