util/drirc: turn on force_glsl_extensions_warn for No Mans Sky

util/drirc: turn on force_glsl_extensions_warn for No Mans Sky

The game forgets to enable multiple extensions in its shaders, one
of those extesions is EXT_texture_array. But enabling this config
entry fixes at least one other rendering issue that enabling
EXT_texture_array on its own doesn't fix.

Reviewed-by: Marek Olšák <marek.olsak@amd.com>