message: Remove export of GLVersion from GLAD
  This symbol conflicts with a duplicate symbol when we link Dawn into
  Chromium on Linux.
diff: @@ -81,7 +81,7 @@ typedef void* (* GLADloadproc)(const char *name);
  # endif
  #endif
  -GLAPI struct gladGLversionStruct GLVersion;
  +extern struct gladGLversionStruct GLVersion;
  GLAPI int gladLoadGL(void);
  