mesa: add const flags to skip MaxVarying and MaxUniform linker checks (v2)

This is only temporary until a better solution is available.

v2: print warnings and add gallium CAPs

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

src/mesa/state_tracker/st_extensions.c

@@ -222,6 +222,12 @@ void st_init_limits(struct st_context *st)
    c->UniformBooleanTrue = ~0;
 
    c->StripTextureBorder = GL_TRUE;
+
+   c->GLSLSkipStrictMaxUniformLimitCheck =
+      screen->get_param(screen, PIPE_CAP_TGSI_CAN_COMPACT_CONSTANTS);
+
+   c->GLSLSkipStrictMaxVaryingLimitCheck =
+      screen->get_param(screen, PIPE_CAP_TGSI_CAN_COMPACT_VARYINGS);
 }