[Support] Move header to WithColor header

Forgot to move the CommandLine.h include form the implementation to the
header and didn't notice the failure with my local modules build.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@333177 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Support/WithColor.cpp

@@ -8,7 +8,6 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Support/WithColor.h"
-#include "llvm/Support/CommandLine.h"
 #include "llvm/Support/raw_ostream.h"
 
 using namespace llvm;