Fix build break after r298623

Use the -color-output option explicitly to eliminate the ANSI color codes in
pdb-native-summary.test.  (The default should have done this.)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@298625 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed