Like with /usr/lib + /usr/lib/compat, add the optional /usr/lib32/compat
to the ldconfig32 default path.  /usr/lib32 is the 32 bit versions of
*current* libraries, while old versions should be able to be in
/usr/lib32/compat, like with /usr/lib/compat.  The separation is meant to
keep the compile time default search paths cleaner.