mesa/main: require EXT_texture_integer for GL 3.0

The GL enums from this extension got promoted to GL 3.0, so we need to
test for it before we bump the GL version. If not, bad things will
happen when people try using them.

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29528>

src/mesa/main/version.c

@@ -284,6 +284,7 @@ compute_version(const struct gl_extensions *extensions,
                          extensions->EXT_framebuffer_sRGB &&
                          extensions->EXT_packed_float &&
                          extensions->EXT_texture_array &&
+                         extensions->EXT_texture_integer &&
                          extensions->EXT_texture_shared_exponent &&
                          extensions->EXT_transform_feedback &&
                          extensions->NV_conditional_render);