Fix implicit type conversions and warnings on windows builds

The visual studio windows builds spit dozens of lines of warnings
on these.

Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>

tests/unittests/torture_options.c

@@ -1453,6 +1453,8 @@ static void torture_options_getopt(void **state)
     /* Test with all the supported options */
     rc = ssh_options_getopt(session, &argc, (char **)argv);
 #ifdef _MSC_VER
+    UNUSED_VAR(new_level);
+
     /* Not supported in windows */
     assert_ssh_return_code_equal(session, rc, -1);
 #else