[3.7] Revert "[3.7] bpo-34589: Add -X coerce_c_locale option; C locale coercion off by default (GH-9379)"

[vstinner]

This reverts commit 144f1e2.

https://bugs.python.org/issue34589

[ncoghlan]

Thanks. I think leaving the 3.7 branch alone is the best way to go here, and then we can wrangle at our leisure on how to get the locale coercion implementation back to its as-designed-and-initially-implemented architecture for 3.8+

[vstinner]

Oh wow, I have been bitten by two random CI bugs from the outer space:

• Travis CI failed because of the random test_socket failure: https://bugs.python.org/issue33937
• test_subprocess hangs on Windows!? "running: test_subprocess (53 min 15 sec)"

I restarted the Travis CI job.

[vstinner]

Oh, on AppVeyor, test_functools failed a timeout after 20 min on test_parallel_meta_path().

Linux-PR CI failed to build its environment:

2018-09-19T11:14:10.5896975Z E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable)

CIs are grumpy today.

[vstinner]

Close/reopen to retrigger AppVeyor job.