Use POSIX argument syntax in test rewrite-includes-messages.c
Use POSIX argument syntax in test rewrite-includes-messages.c

Invoke diff such that options precede operands. Not doing so leads to
unspecified behaviour under the LSB.


git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@321830 91177308-0d34-0410-b5e6-96231b3b80d8

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