cogl-material: Add support for point sprites

This adds a new API call to enable point sprite coordinate generation
for a material layer:

void
cogl_material_set_layer_point_sprite_coords_enabled (CoglHandle material,
                                                     int layer_index,
                                                     gboolean enable);

There is also a corresponding get function.

Enabling point sprite coords simply sets the GL_COORD_REPLACE of the
GL_POINT_SPRITE glTexEnv when flusing the material. There is no
separate application control for glEnable(GL_POINT_SPRITE). Instead it
is left permanently enabled under the assumption that it has no affect
unless GL_COORD_REPLACE is enabled for a texture unit.

http://bugzilla.openedhand.com/show_bug.cgi?id=2047

cogl/driver/gl/cogl-feature-functions.h

@@ -380,3 +380,10 @@ COGL_FEATURE_FUNCTION (void, glBlendEquationSeparate,
                        (GLenum                modeRGB,
                         GLenum                modeAlpha))
 COGL_FEATURE_END ()
+
+COGL_FEATURE_BEGIN (point_sprites, 2, 0,
+                    "ARB\0",
+                    "point_sprite\0",
+                    COGL_FEATURE_POINT_SPRITE,
+                    0)
+COGL_FEATURE_END ()