Reposition clang-builtin include/ to immediately precede /usr/include/, matching gcc compiler. Fixes #include_next <...> shenanigans that lead to file-not-found failures with <cstddef> on libstdc++ 4.3.[012].
Reposition clang-builtin include/ to immediately precede /usr/include/,
matching gcc compiler. Fixes #include_next <...> shenanigans that lead to
file-not-found failures with <cstddef> on libstdc++ 4.3.[012].

Updated C++ include header search paths for various Debian/Ubuntu and Fedora
linux distros.


git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@103177 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang