to compute the limit at compile time instead of runtime. Patch writen by Serhiy
Storchaka.

PyAccu API. For example, it makes str.format() from 25% to 30% faster on Linux.

Issue #14700: Fix two broken and undefined-behaviour-inducing overflow checks in old-style string formatting.  Thanks Serhiy Storchaka for report and original patch.

Also, add tests for gzip.open().

Issue #9116: Allowed test to pass on Windows by adjusting the test condition slightly to allow for a Windows-specific error message.

Closes #14729: Allowed test to pass on Windows by adjusting the test condition slightly to allow for a Windows-specific error message.