Typo and missing checkin from r131186.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131187 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/Windows/Program.inc b/lib/Support/Windows/Program.inc
index 350363c..b685bb8 100644
--- a/lib/Support/Windows/Program.inc
+++ b/lib/Support/Windows/Program.inc
@@ -332,7 +332,8 @@
 int
 Program::Wait(const Path &path,
               unsigned secondsToWait,
-              std::string* ErrMsg) {
+              std::string* ErrMsg,
+              const char* /*SignalPrefix*/) {
   if (Data_ == 0) {
     MakeErrMsg(ErrMsg, "Process not started!");
     return -1;