fix building of python modules that have tarballs named .tgz and .zip #2002
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This fixes building of (at least):
https://pypi.org/project/amqplib/1.0.2/
https://pypi.org/project/dnspython/1.15.0/
Wrap the operation within a Dir.chdir() to simplify the use of multiple globs (older ruby does not support the ':base' option to Dir.glob()).