[core] use constexpr string concatenation for uniform/attribute names

scripts/generate-shaders.js

@@ -23,6 +23,11 @@ function basicMinify(src) {
 }
 
 for (const key in shaders) {
+    // Rename a_*_t uniforms to u_*_t. This is a workaround until we can use
+    // https://github.com/mapbox/mapbox-gl-js/pull/8055, which is blocked by
+    // https://github.com/mapbox/mapbox-gl-native/issues/13984
+    shaders[key].vertexSource = shaders[key].vertexSource.replace(/\ba_(\w+)_t\b/mg, 'u_$1_t');
+
     const vertex = concatenated.length;
     concatenated += basicMinify(shaders[key].vertexSource);
     concatenated += '\n\0';