PATCH [committed]: remove broken external links in GCC manual

[Sandra Loosemore <sandra at codesourcery dot com>]

I ran a link checker on the HTML version of the GCC manual, and found a couple 
broken external links.  It seems best just to remove them, therefore I've 
checked in this patch as obvious.

(I also found a bunch of broken internal links, but that looks like a problem 
with makeinfo rather than the document sources.)

-Sandra

2009-07-16  Sandra Loosemore  <sandra@codesourcery.com>

	gcc/
	* doc/extend.texi (Nested Functions): Replace broken link with
	textual reference.
	* doc/service.texi (Service): Remove broken link.

Index: gcc/doc/extend.texi
===================================================================
--- gcc/doc/extend.texi	(revision 149693)
+++ gcc/doc/extend.texi	(working copy)
@@ -451,10 +451,9 @@ does not refer to anything that has gone
 safe.
 
 GCC implements taking the address of a nested function using a technique
-called @dfn{trampolines}.  A paper describing them is available as
-
-@noindent
-@uref{http://people.debian.org/~aaronl/Usenix88-lexic.pdf}.
+called @dfn{trampolines}.  This technique was described in 
+@cite{Lexical Closures for C++} (Thomas M. Breuel, USENIX
+C++ Conference Proceedings, October 17-21, 1988).
 
 A nested function can jump to a label inherited from a containing
 function, provided the label was explicitly declared in the containing
Index: gcc/doc/service.texi
===================================================================
--- gcc/doc/service.texi	(revision 149693)
+++ gcc/doc/service.texi	(working copy)
@@ -23,6 +23,3 @@ Look in the service directory for someon
 The service directory is found at
 @uref{http://www.gnu.org/prep/service.html}.
 @end itemize
-
-For further information, see
-@uref{http://gcc.gnu.org/faq.html#support}.