Fix run_tests.bat [ci skip]

Abscissa · Abscissa · commit c33b1f23d3a3 · 2018-07-15T22:37:35.000-04:00
diff --git a/run_tests.bat b/run_tests.bat
@@ -1,7 +1,7 @@
 @echo off
 
 rem Compile using $DMD if it exists, otherwise use dmd
-if not "%DMD%" == "" set DMD=dmd
+if "%DMD%" == "" set DMD=dmd
 
 echo DMD=%DMD%
 %DMD% -ofrun_tests_bin run_tests.d && run_tests_bin %*
