Reviewed-by: Eric Engestrom <eric@engestrom.ch>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6915>
- fixed bug in GL_IBM_rasterpos_clip (missing return)
- GL_DEPTH_TEXTURE_MODE = GL_ALPHA didn't work correctly
- a few Solaris compilation fixes
-- fixed glClear() problem for DRI drivers (non-existant stencil, etc)
+- fixed glClear() problem for DRI drivers (non-existent stencil, etc)
- fixed int/REAL mixup in GLU NURBS curve evaluator (Eric Cazeaux)
- fixed delete [] bug in SI GLU (bug 721765) (Diego Santa Cruz)
- glFog() didn't clamp fog colors