thread_local support in MinGW seems to be buggy.

Fixes #325.

Change-Id: I4d3a2bde514283e15ac2ab6928428ea59ab9b2f0
Reviewed-on: https://code-review.googlesource.com/c/re2/+/59230
Reviewed-by: Paul Wankadia <junyer@google.com>
1 file changed