Bug 1626188 - ensure shader keys are in sorted order. r=jimb

Differential Revision: https://phabricator.services.mozilla.com/D70555

--HG--
extra : moz-landing-system : lando

gfx/wr/swgl/build.rs

@@ -112,6 +112,8 @@ fn main() {
         }));
     }
 
+    shaders.sort();
+
     for shader in &shaders {
         translate_shader(shader, &shader_dir);
     }