_GLIBCPP_HAVE_S_ISREG always undefined for cross compilers (problem with ifstream::in_avail())

[Benjamin Kosnik]

>For a native build, _GLIBCPP_HAVE_SYS_IOCTL_H and _GLIBCPP_HAVE_S_ISREG is 
>defined and _GLIBCPP_HAVE_S_IFREG is undefined for me in gcc-3.3's libstdc++.

I'm checking this into mainline, and something like it into gcc-3_3-branch.

Thanks,
benjamin

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