Changes

Fix dependency generation when tools are disabled

The OPTIONAL_BYTECODE_TOOLS, OPTIONAL_NATIVE_TOOLS and
OPTIONAL_LIBRARIES should be being used to affect build and
installation, not definitions. If ocamltest et al were disabled, then
the definitions of these programs were omitted, which prevents the
reproducible generation of dependency information.

Fix generation of config.status for dynlink

Running config.status works correctly, but individually requesting links
in otherlibs/dynlink did not because the names were specified using a
shell variable (i.e. at configure-time) instead of a m4sh variable (i.e.
at autoconf-time).

Don't generate ocamltest_config.ml when not needed

Correct ocamltest-manual