nir/linker: Set the uniform initial values

This is based on link_uniform_initializers.cpp.

v2: move from compiler/nir to compiler/glsl (Timothy Arceri)

Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>

src/compiler/glsl/meson.build

@@ -69,6 +69,7 @@ files_libglsl = files(
   'gl_nir_lower_atomics.c',
   'gl_nir_lower_samplers.c',
   'gl_nir_lower_samplers_as_deref.c',
+  'gl_nir_link_uniform_initializers.c',
   'gl_nir_link_uniforms.c',
   'gl_nir_linker.h',
   'gl_nir.h',