Fix Windows tests when __config_site is present.
Previously, the force includes would complain about a missing _DEBUG symbol.
Now we dump macros before adding the force includes to the command line.
Now with proper newlines.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@302497 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed