Fix win32 support header for mingw32.

These functions are defined as static in the mingw32 headers.


git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@219140 91177308-0d34-0410-b5e6-96231b3b80d8
Fix for PR 19616: 'tuple_cat of nested tuples fails in noexcept specification'. Thanks to Louis Dionne for the fix.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@219243 91177308-0d34-0410-b5e6-96231b3b80d8
Merge branch 'master' of http://llvm.org/git/libcxx
Fixes PR21157 'tuple: non-default constructible tuple hard failure' Thanks to Louis Dionne for the bug report and the patch.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@219785 91177308-0d34-0410-b5e6-96231b3b80d8
Merge branch 'master' of http://llvm.org/git/libcxx