winpthreads: Regenerate autotools scripts with automake 1.16.5

This is done by running `WANT_AUTOMAKE=1.16 autoreconf -ifv` in the
winpthreads directory.

Signed-off-by: Antonin Décimo <antonin@tarides.com>
Signed-off-by: Martin Storsjö <martin@martin.st>
2 files changed