libltdl module search order

[Gary V. Vaughan]

Here is a patch to correct the order of searching for an unqualified
module in libltdl.  It is easier to explain by example:

   m4 wants to load a module called m4.la:  without this patch
   lt_dlopen("m4") will try to open the m4 binary and fail rather than
   use the supplied user_search_path to locate m4.la (or m4.so).
   
This solution simply says that if the supplied module has no directory
component, and any of the useful PATH values (user_search_path
LTDL_LIBRARY_PATH etc.) are available, try looking in those locations
before trying the working directory.

Okay to commit?

Cheers,
        Gary.
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2000-11-25-ltdl-search-order.patch
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