Add s390x z14 support to gcc command

Merged Bitbucket Importer requested to merge bitbucket/merged-pr-645 into branch/py3.6

Created originally on Bitbucket by djones6 (DeVerne Jones)

Was already merged in Bitbucket before import, marked as merged by the import user

GCC has been updated for z14 architecture. Tested on z14,

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