[PATCH, gdbserver] Check for libdl before using it

[Maxim Kuvyrkov]

The following patch fixes build of gdbserver on platforms that do not 
support dynamic libraries, e.g., m68k-uclinux.

At the moment the build of gdbserver/thread-db.c fails for m68k-uclinux 
and, possibly, other similar architectures due to thread-db.c assuming 
that there is dlfcn.h header / libdl library installed.

This patch adds a configure check for libdl and, if it is not present, 
falls back to linking in static libthread_db.a.

Daniel J. approved this patch off-line, so I will commit it shortly.

Regards,

-- 
Maxim Kuvyrkov
CodeSourcery
maxim@codesourcery.com
(650) 331-3385 x724
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