[cfe-commits] Support -cxx-isystem and removal of -cxx-system-include

[Joerg Sonnenberger]

Hi all,
this patch supersedes the version in PR 8945. It provides the
-cxx-isystem option as found in NetBSD's gcc. It works like -isystem,
but is skipped for non-C++ builds. It can be used (in combination with
-nostdinc++) to switch the C++ STL implementation and it is useful for
cross-compiling. The patch also removes the former cc1-only option
-cxx-system-include, since the functionality is effectively contained.
Compared to the earlier version, -cxx-isystem and -isystem are kept in
order relative to each other.

Joerg
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