Always check __STDC_LIB_EXT1__ before __STDC_WANT_LIB_EXT1__ #3151
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Accommodating environments that define
__STDC_WANT_LIB_EXT1__
even if__STDC_LIB_EXT1__
is not defined by the implementation.Follow-on to PR #3129.
Fixes Google-internal macos builds, but this is generally more correct.
Changelog not needed: PR #3129 was not released yet.