Revert "Revert "Windows: Add support for unicode command lines""

This reverts commit r192070 which reverted r192069, I forgot to
regenerate the configure scripts.

llvm-svn: 192079
diff --git a/llvm/cmake/config-ix.cmake b/llvm/cmake/config-ix.cmake
index 57725f8..dc991a2 100755
--- a/llvm/cmake/config-ix.cmake
+++ b/llvm/cmake/config-ix.cmake
@@ -415,6 +415,7 @@
 if( MINGW )
   set(HAVE_LIBIMAGEHLP 1)
   set(HAVE_LIBPSAPI 1)
+  set(HAVE_LIBSHELL32 1)
   # TODO: Check existence of libraries.
   #   include(CheckLibraryExists)
   #   CHECK_LIBRARY_EXISTS(imagehlp ??? . HAVE_LIBIMAGEHLP)