Fix clang script to detect -cc1

If the first argument is -cc1, don't specify "-target" again because
it has been spelled out in the previous invocation.  In fact, clang
under -cc1 doesn't understand "-target" at all (knows the equivalent
"-triple" well, though)

Also add "@echo off" to clang.cmd and clang++.cmd

Change-Id: I38ee3b93ab464e022e635447109cd6aab4c10dbb
1 file changed