patch to check ld

[Benjamin Kosnik]

Yeah check this in. I knew that just flat-out adding it to the linker 
line was lazy and wrong, but was hoping that it would get fixed magically. 
Probably a poor decision, but oh well. I wanted this in, and the easiest 
place to store this info was in the Makefile itself.

Cool. 

Check it in.

thanks
benjamin

ps. the cosmetic changes in configure.in checked in last night were due 
to experimentation with newer autoconfs--seems like some of the "dnl" 
line wraps were confusing it. If you are so motivated, you might want to 
go ahead and make configure.in/acinclude.m4 "forward compatible" with 
newer autoconfs. (Since many of these autoconf macros originated with you.)
We're not ready to jump up to the never versions yet, but maybe soon.