main: Added entry point for glTransformFeedbackBufferRange

v2: review from Laura Ekstrand
- use the refactored code to lookup the objects
- improve some error messages
- factor out the gl method name computation
- better handle the spec differences between the DSA and non-DSA cases
- quote the spec a little more

v3: review from Laura Ekstrand
- use the new name of _mesa_lookup_bufferobj_err
- swap the comments around the offset and size checks

v4: review from Laura Ekstrand
- add more spec quotes
- properly fix the comments around the offset and size checks

v5: review from Laura Ekstrand
- add quotes on the spec citations
- revert some changes in the printf format

v6: review from Laura Ekstrand
- remove a redondant "gl" in a method name

Signed-off-by: Martin Peres <martin.peres@linux.intel.com>
Reviewed-by: Laura Ekstrand <laura@jlekstrand.net>

src/mapi/glapi/gen/ARB_direct_state_access.xml

@@ -20,6 +20,14 @@
       <param name="buffer" type="GLuint" />
    </function>
 
+   <function name="TransformFeedbackBufferRange" offset="assign">
+      <param name="xfb" type="GLuint" />
+      <param name="index" type="GLuint" />
+      <param name="buffer" type="GLuint" />
+      <param name="offset" type="GLintptr" />
+      <param name="size" type="GLsizeiptr" />
+   </function>
+
    <!-- Buffer object functions -->
 
    <function name="CreateBuffers" offset="assign">