Xcode prints a warning that "Adjust ANGLE Paths" runs on every build invocation because no outputPaths are provided. This change updates the rule to touch a temporary file once it's completed so the rule has an outputPath to check, disabling the warning.
<rdar://problem/102830463>
Pull request: https://github.com/WebKit/WebKit/pull/6993
In the past it was important for this script to be side-effect-free in the situation where the contents of the adjusted header files were unchanged. Otherwise a large number of source files would be unnecessarily recompiled during incremental builds. This is just a heads up for a scenario to test with any changes to the script's behavior.