[rfa:threads] Report when using libthread_db

[Michael Elizabeth Chastain]

Crap.  I'm having test bed troubles here.  My test bed says that
there are regressions in gdb.base/relocate.exp, but it turns out
that I have extra crap in my versions of gdb, so my before/after
property is dirty.  Then I re-ran it and borked up the commands.

I gotta forget about other stuff and focus on getting a clean
test of this patch.

Michael C

  2003-08-05  Andrew Cagney  <cagney@redhat.com>

	  * thread-db.c (verbose_dlsym): New function.
	  (thread_db_load): Use verbose_dlsym
	  (thread_db_new_objfile): Print that libthread_db was loaded, and
	  that thread debugging was enabled.