scan-build: Prune off any trailing '/' characters in the output directory path.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@65368 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/scan-build b/utils/scan-build
index f1fbb55..99a7990 100755
--- a/utils/scan-build
+++ b/utils/scan-build
@@ -145,6 +145,9 @@
     
     $TmpMode = 1;
   }
+  
+  # Chop off any trailing '/' characters.
+  while ($Dir =~ /\/$/) { chop $Dir; }
 
   # Get current date and time.