tools/mvsc: turn batch files silent again (the problem was not there)

tools/mvsc/starpu_clean.bat

@@ -1,4 +1,4 @@
-rem @ECHO OFF
+@ECHO OFF
 
 REM StarPU --- Runtime system for heterogeneous multicore architectures.
 REM

tools/mvsc/starpu_exec.bat

@@ -1,4 +1,4 @@
-rem @ECHO OFF
+@ECHO OFF
 
 REM StarPU --- Runtime system for heterogeneous multicore architectures.
 REM

tools/mvsc/starpu_open.bat

@@ -1,4 +1,4 @@
-rem @ECHO OFF
+@ECHO OFF
 
 REM StarPU --- Runtime system for heterogeneous multicore architectures.
 REM

tools/mvsc/starpu_var.bat.in

@@ -1,4 +1,4 @@
-rem @ECHO OFF
+@ECHO OFF
 
 REM StarPU --- Runtime system for heterogeneous multicore architectures.
 REM