Add GL_RENDERBUFFER to the TextureTarget group

The 'target' parameter of the glGetInternalformati* functions belongs to
the TextureTarget group. GL_RENDERBUFFER is a valid value for 'target'
in the glGetInternalformati* functions. Hence, GL_RENDERBUFFER was added
to the TextureTarget group.
diff --git a/xml/gl.xml b/xml/gl.xml
index 6386ea0..e7b2e44 100644
--- a/xml/gl.xml
+++ b/xml/gl.xml
@@ -4948,7 +4948,7 @@
         <enum value="0x8D40" name="GL_FRAMEBUFFER" group="ObjectIdentifier,FramebufferTarget,CheckFramebufferStatusTarget"/>
         <enum value="0x8D40" name="GL_FRAMEBUFFER_EXT"/>
         <enum value="0x8D40" name="GL_FRAMEBUFFER_OES" group="FramebufferTarget"/>
-        <enum value="0x8D41" name="GL_RENDERBUFFER" group="ObjectIdentifier,RenderbufferTarget,CopyImageSubDataTarget"/>
+        <enum value="0x8D41" name="GL_RENDERBUFFER" group="ObjectIdentifier,RenderbufferTarget,CopyImageSubDataTarget,TextureTarget"/>
         <enum value="0x8D41" name="GL_RENDERBUFFER_EXT"/>
         <enum value="0x8D41" name="GL_RENDERBUFFER_OES" group="RenderbufferTarget"/>
         <enum value="0x8D42" name="GL_RENDERBUFFER_WIDTH" group="RenderbufferParameterName"/>