[issue19232] Speed up _decimal import

[Roundup Robot]

Roundup Robot added the comment:

New changeset 75b5617b8dfc by Stefan Krah in branch 'default':
Issue #19232: Fix sys.modules lookup (--without-threads)
https://hg.python.org/cpython/rev/75b5617b8dfc

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<http://bugs.python.org/issue19232>
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