Fixing Windows batch NULL output for test batch script modification

Author: mikefero

ext/vc_build.bat

@@ -752,13 +752,13 @@ IF !ENABLE_BUILD_PACKAGES! EQU !FALSE! (
     ECHO done.
     IF EXIST bin\behat.bat (
       RENAME bin\behat.bat behat.bak
-      ECHO @ECHO %%PATH%% ^| FIND /C /I ^"!ABSOLUTE_DRIVER_LIBRARY_DIRECTORY!^"^>NULL ^|^| @SET ^"PATH=!ABSOLUTE_DRIVER_LIBRARY_DIRECTORY!;%%PATH%%^" > bin\behat.bat
+      ECHO @ECHO %%PATH%% ^| FIND /C /I ^"!ABSOLUTE_DRIVER_LIBRARY_DIRECTORY!^"^>NUL ^|^| @SET ^"PATH=!ABSOLUTE_DRIVER_LIBRARY_DIRECTORY!;%%PATH%%^" > bin\behat.bat
       TYPE bin\behat.bak >> bin\behat.bat
       ERASE bin\behat.bak
     )
     IF EXIST bin\phpunit.bat (
       RENAME bin\phpunit.bat phpunit.bak
-      ECHO @ECHO %%PATH%% ^| FIND /C /I ^"!ABSOLUTE_DRIVER_LIBRARY_DIRECTORY!^"^>NULL ^|^| @SET ^"PATH=!ABSOLUTE_DRIVER_LIBRARY_DIRECTORY!;%%PATH%%^" > bin\phpunit.bat
+      ECHO @ECHO %%PATH%% ^| FIND /C /I ^"!ABSOLUTE_DRIVER_LIBRARY_DIRECTORY!^"^>NUL ^|^| @SET ^"PATH=!ABSOLUTE_DRIVER_LIBRARY_DIRECTORY!;%%PATH%%^" > bin\phpunit.bat
       TYPE bin\phpunit.bak >> bin\phpunit.bat
       ERASE bin\phpunit.bak
     )