Support for external PyYAML and Python 3 #622
Merged
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Bugfix.
If you install PyYAML for Python 3, it'll get picked up by Rez's own PyYAML vendor library due to their ugly method of detecting a C-compiled sibling library.
This PR strips the vendored PyYAML from looking outside of itself and thus facilitates a third-party PyYAML from co-existing as a Rez package.