cp-demangle.c & dyn-string.c NULL patch

[Kaveh R. Ghazi]

 > From: Mark Mitchell <mark@codesourcery.com>
 > 
 > These patches are OK.  I wish NULL were defined in ansidecl.h, or some
 > such place, but it's not, and there are reasons why that would be
 > tricky.
 > Thanks!

One of the things I've been meaning to do is to create a
libiberty/system.h so we solve these problems once and for all like we
did in the gcc directory.  Everytime we add a new file something
breaks. :-)

		--Kaveh
--
Kaveh R. Ghazi			Engagement Manager / Project Services
ghazi@caip.rutgers.edu		Qwest Internet Solutions