Revert "Windows: Add support for unicode command lines"

This is causing MinGW bots to fail.
This reverts commit r192069.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192070 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Support/Unix/Process.inc

@@ -190,14 +190,6 @@ Optional<std::string> Process::GetEnv(StringRef Name) {
   return std::string(Val);
 }
 
-error_code Process::GetArgumentVector(SmallVectorImpl<const char *> &ArgsOut,
-                                      ArrayRef<const char *> ArgsIn,
-                                      SpecificBumpPtrAllocator<char> &) {
-  ArgsOut.append(ArgsIn.begin(), ArgsIn.end());
-
-  return error_code::success();
-}
-
 bool Process::StandardInIsUserInput() {
   return FileDescriptorIsDisplayed(STDIN_FILENO);
 }