branch 1.3 ltdl.c AIX win32

[Howard Chu]

Here's one of the patches I promised. This provides native AIX dynamic
library support in libltdl. The AIX loader code was stolen from Jens
Uwe-Mager's dlfcn.shar library, http://www.han.de/~jum/aix/dlfcn.shar
and slightly massaged to fit into the libltdl framework. (For anyone
who cares, Perl 5's dynaloader also appears to use an older version
of Jens' code for its AIX support. Unfortunately, that version doesn't
work on AIX 4. I've been meaning to submit a patch to fix this but
haven't yet. So if you're having problems with dynamically loaded perl
modules on AIX 4, that's why.)

There are also a couple small bugfixes to the win32 support - don't call
strchr on NULL filenames, and treat a NULL handle as a reference to the
main program.

I will try to generate a patch against the HEAD branch next.

Howard Chu - Black GTS   http://highlandsun.com
http://people.we.mediaone.net/hyc

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