merge from trunk r4950: _mingw.h (__int128, __SIZEOF_INT128__): Handle clang.

git-svn-id: svn+ssh://svn.code.sf.net/p/mingw-w64/code/stable/v1.x@5337 4407c894-4637-0410-b4f5-ada5f102cad1
3 files changed