mktestsuite: explicitly provide debug flags for benefit of BSD m4

bin/mktestsuite

@@ -278,5 +278,5 @@ test_equal(max(\$2,\$1,\$3), \$3)
 
 include($1)
 EOF
-) | (shift ; $M4 -d "$@" - )
+) | (shift ; $M4 -daqe "$@" - )
 exit $?