Revert r118057, this is better fixed in appendSuffix itself.

llvm-svn: 118088
diff --git a/llvm/lib/Support/SystemUtils.cpp b/llvm/lib/Support/SystemUtils.cpp
index 8d70616..db61e75 100644
--- a/llvm/lib/Support/SystemUtils.cpp
+++ b/llvm/lib/Support/SystemUtils.cpp
@@ -47,9 +47,7 @@
 
   if (!Result.isEmpty()) {
     Result.appendComponent(ExeName);
-    StringRef EXESuffix = sys::Path::GetEXESuffix();
-    if (!EXESuffix.empty())
-      Result.appendSuffix(EXESuffix);
+    Result.appendSuffix(sys::Path::GetEXESuffix());
   }
 
   return Result;