glsl: Retire the non-NIR GLSL linking paths.

Now that we have only GLSL->NIR as a path in the frontend, we can rely on
the NIR linking support.

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8044>

src/compiler/glsl/meson.build

@@ -140,11 +140,9 @@ files_libglsl = files(
   'linker.h',
   'linker_util.h',
   'linker_util.cpp',
-  'link_atomics.cpp',
   'link_functions.cpp',
   'link_interface_blocks.cpp',
   'link_uniforms.cpp',
-  'link_uniform_initializers.cpp',
   'link_uniform_block_active_visitor.cpp',
   'link_uniform_block_active_visitor.h',
   'link_uniform_blocks.cpp',