mesa/main: condition GL_DEPTH_STENCIL on ARB_depth_texture

EXT_packed_depth_stencil is supported by all drivers, but
ARB_depth_texture isn't (notably nouveau_vieux). This should avoid
passing unexpected values down to ChooseTextureFormat.

The EXT_packed_depth_stencil spec does not make any explicit references
to requiring ARB_depth_texture in order to allow textures with that
format, however if there is no dependency, ARB_depth_texture would be
practically implied by the extension.

Signed-off-by: Ilia Mirkin <[email protected]>
Reviewed-by: Francisco Jerez <[email protected]>
Reviewed-by: Ian Romanick <[email protected]>
Cc: "10.0 10.1" <[email protected]>

Note for 10.0 backport: This will produce a conflict, the solution is to
move the surrounding if as well.

0 files changed, 0 insertions, 0 deletions