configure.ac: disable help2man on windows OSes

configure.ac

@@ -1528,7 +1528,12 @@ AM_CONDITIONAL([STARPU_HAVE_ICC], [test "x$ICC" != "x"])
 
 # Do not generate manpages for the tools if we do not have help2man
 AC_CHECK_PROGS([HELP2MAN], [help2man])
+# Disable on windows
+if test "$starpu_windows" = "yes" ; then
+    HELP2MAN=""
+fi
 AM_CONDITIONAL([STARPU_HAVE_HELP2MAN], [test "x$HELP2MAN" != "x"])
+
 AC_CHECK_MEMBER([struct cudaDeviceProp.pciDomainID],
   AC_DEFINE([STARPU_HAVE_DOMAINID],[1],[Define to 1 if CUDA device properties include DomainID]),
   , [[#include <cuda_runtime_api.h>]])