tools/mvsc/starpu_var.bat.in: fix STARPU_INCLUDEDIR

tools/mvsc/starpu_var.bat.in

@@ -25,7 +25,7 @@ ECHO.
 ECHO Setting environment from %STARPU_PATH%
 
 set STARPU_LIBDIR=%STARPU_PATH%/lib
-set STARPU_INCLUDEDIR=%PREFIX%/include
+set STARPU_INCLUDEDIR=%STARPU_PATH%/include
 set STARPU_CFLAGS=/I%STARPU_INCLUDEDIR%\starpu\@STARPU_EFFECTIVE_VERSION@ @STARPU_CUDA_CPPFLAGS@
 set STARPU_LDFLAGS=/link %STARPU_PATH%\lib\libstarpu-@STARPU_EFFECTIVE_VERSION@.lib