re PR libstdc++/43738 (basic_file_stdio.cc uses ioctl on a fd, but not available on mingw32)

2010-12-02  Kai Tietz  <kai.tietz@onevision.com>

        PR libstdc++/43738
        * config/io/basic_file_stdio.cc (showmanyc): Check _GLIBCXX_NO_IOCTL
        before use of ioctl.
        * config/os/mingw32/os_defines.h (_GLIBCXX_NO_IOCTL): New.

From-SVN: r167369