[cfe-commits] [patch] Remove most of the --with-cxx-* logic

[Rafael Espíndola]

I noticed a small regression when using --with-cxx-include-dir (/32
was not being added to the lib search dir). The good news is that the
new logic for detecting gcc installations progressed so much that we
should be able to remove most of the special cases.

The attached patches replace the existing options with a single
--with-cxx-install-dir and the only thing the new option does is point
the existing detection logic to the directory it is given.

Are the patches OK?

Cheers,
Rafael
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