Enhancements:
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* populate SHLIB_EXT environment variable.  For example, .so, .dll, .dylib file extensions use this for their native ending.  #1478

Bug fixes:
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* fix metapackage not going through api, thus not showing output file path.  #1470
* restore script exe creation on Windows.  These are for standalone scripts installed by distutils or setuptools in setup.py.  #1471
* fix noarch value propagation from meta.yaml to config.  Was causing noarch to not be respected in some cases.  #1472
* fix calls to subprocess not converting unicode to str  #1473
* restore detect_binary_files_with_prefix behavior - in particular, respect it when false.  # 1477