feat: Add an executable_test rule and use it in write_source_file #1090
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Adds executable_test, which checks that a file or directory's executable permissions are as intended. Implementation is mostly copied from diff_test. Tested on Linux, since that's what I have. As far as I remember, the executable permission doesn't exist on Windows, so I've made the Windows version of the test always pass.
Added this to write_source_files, so that when diff_test is true, the executable permission will be checked as well as diffing the contents.
I considered having a separate executable_test arg instead of controlling them both with diff_test - can switch to that if you prefer.
Fixes #1089.