run-tests: Make sure to actually run tests when run on native windows

run-tests.sh

@@ -14,7 +14,9 @@ export PATH=$PREFIX/bin:$PATH
 if [ -z "$RUN_X86" ]; then
     case $(uname) in
     MINGW*)
-        RUN_X86=
+        # A non-empty string to trigger running, even if no wrapper is needed.
+        RUN_X86=" "
+        export PATH=.:$PATH
         ;;
     *)
         RUN_X86=wine