mesa: add EXT_shader_image_load_store glBindImageTextureEXT function

The implementation is almost identical to glBindImageTexture except for error
checking.

Reviewed-by: Marek Olšák <marek.olsak@amd.com>

src/mapi/glapi/gen/EXT_shader_image_load_store.xml

@@ -61,7 +61,6 @@
 <enum name="MAX_IMAGE_SAMPLES_EXT" value="0x906D"/>
 <enum name="IMAGE_BINDING_FORMAT_EXT" value="0x906E"/>
 
-<!--
 <function name="BindImageTextureEXT">
   <param name="index" type="GLuint"/>
   <param name="texture" type="GLuint"/>
@@ -71,7 +70,6 @@
   <param name="access" type="GLenum"/>
   <param name="format" type="GLint"/>
 </function>
--->
 
 <function name="MemoryBarrierEXT" alias="MemoryBarrier" >
   <param name="barriers" type="GLbitfield"/>

src/mapi/glapi/gen/static_data.py

@@ -1551,6 +1551,7 @@ offsets = {
     "GetMultiTexGenfvEXT": 1515,
     "GetMultiTexGenivEXT": 1516,
     "MultiTexCoordPointerEXT": 1517,
+    "BindImageTextureEXT": 1518,
 }
 
 functions = [