[cfe-dev] Ubuntu install location fixes

[Gonsolo]

Attached is a patch for automatical determination of c++ include paths.
CXX_INCLUDE_ROOT and CXX_INCLUDE_ARCH can be set manually or otherwise 
are determined from the host system.
It works by looking at /usr/include/c++ and using the latest revision.
Then it looks for a list of files in that directory like i486-linux-gnu 
and uses the first existing one.
This patch is for the cmake build system only.
It is aimed to replace he hardcoded paths in clang's 
lib/Frontend/InitHeaderSearch.cpp.

This patch is tested with Ubuntu 9.10. It correctly guesses 
/usr/include/c++/4.4.1 and i486-linux-gnu on my system. After that clang 
doesn't abort with "cannot find bits/c++config.h" anymore.

The list of directories only has 3 entries right now, it has to be 
expanded for all the other systems.

g
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