memory leak in unload(`gnu')

[Eric Blake]

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This is not a complete fix (I'm still trying to track down where else
memory is being leaked), but greatly reduces the lost memory when
repeatedly loading and unloading the gnu module (before the patch, the
added test grew to over 5.5M of mem usage; after, it grew to just 3.2M).
I also found a libltdl memleak in the process.  I wish I knew a portable
way to artifically cap the heap usage and cause a memory exhausted error
in the face of a leak, without making the test take too long to execute.
But this test is at least valuable in that we don't coredump when the gnu
module is dlpreloaded, and hence variables aren't reset to their initial
state between unload and load (as I did run into that situation while
preparing this patch).

2006-10-03  Eric Blake  <address@hidden>

        Partially plug memory leak when unloading gnu module.
        * tests/modules.at (unload gnu module): New test.
        * modules/gnu.c (gnu_LTX_m4_finish_module): New function.
        (m4_regexp_compile): Move static storage to module visibility.
        * tests/options.at (--debug): Adjust to new output.

- --
Life is short - so eat dessert first!

Eric Blake             address@hidden
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