[issue30540] regrtest: add --matchfile option

[STINNER Victor]

STINNER Victor added the comment:


New changeset a0ccc54e6dffacf9e7c06f2a3e9056d2d35d21eb by Victor Stinner in branch '3.6':
Synchronize libregrtest from master to 3.6 (#2244)
https://github.com/python/cpython/commit/a0ccc54e6dffacf9e7c06f2a3e9056d2d35d21eb


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