[lit] Replace print with lit_config.note().

This commit replaces print statement with lit_config.note().  This fixes
python3 support for check-libcxxabi.


git-svn-id: https://llvm.org/svn/llvm-project/libcxxabi/trunk@280484 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed