Add test_pg_dump to @contrib_excludes

The test_pg_dump extension doesn't have a C component, so we need
to exclude it from the MSVC build system trying to figure out how
to build it.

Also add a "MODULES" line to the Makefile, as test_extensions has.
Might not be necessary, but seems good to keep things consistent.

Lastly, remove the 'installcheck' line from test_pg_dump, as that
was causing redefinition errors, at least on my box.  This also
makes test_pg_dump consistent with how commit_ts is set up.

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