Previous patch did not work on MacOS X, and I don't have shell

access to that host.

* src/tgbatest/kv.test: Use ${DOT-true} instead of ${DOT-:}.  I
don't know, the MacOS shell must be mixing the syntaxes for
${DOT:-} and ${DOT-:}.
* iface/nips/nipstest/dotty.test: Likewise

iface/nips/nipstest/dotty.test

@@ -26,6 +26,6 @@ set -e
 BYTECODE="never.pr.b regbit.b"
 for bytecode in $BYTECODE; do
     run 0 "$top_builddir/dottynips" "$srcdir/$bytecode" > dotty || exit 1
-    "${DOT-:}" -Tps dotty > /dev/null || exit 1
+    "${DOT-true}" -Tps dotty > /dev/null || exit 1
     rm -f dotty
 done