* configure.ac: Add user-friendly check for native x86_64-linux multilibs. * configure: Regenerate.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@205975 138bc75d-0d04-0410-961f-82ee72b054a4
        Fix compilation error for cygwin native build.
        * windows-nat.c (windows_ensure_ntdll_loaded) [__USEWIDE]:
        Call wcstombs.
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