possibly acceptable workaround for rlm_perl/dlopen problem on Debian

[Alan DeKok]

Enrik Berkhan wrote:
> You would never dlopen libperl.so. If you dlopen another package's
> shared library, you should always use versioned ones. Otherwise, you'll
> be trapped by every ABI change.

  Then "perl ... ldopts" should print out the proper Perl library
version number.  It doesn't.  It's broken.

> The exact version of libperl.so.x.y that has to be used should be
> determined by autotools (may be with help by ExtMod:: stuff).

  That's not how shared libraries should work.  A system should have:

libfoo.so.x.y
libfoo.so.x -> libfoo.so.x.y
libfoo.so -> libfoo.so.x

  When you say "-lfoo", the linker should pick "libfoo.so.x.y", OR
"libfoo.so.x".  Picking "libfoo.so" is broken.

> Additionally, I didn't mean to integrate this in FreeRADIUS directly but
> to be considered by the Debian FreeRADIUS maintainers.

  I've updated the configure scripts to NOT build rlm_perl if the module
can't link.

  Alan DeKok.