add etc/PROBLEMS entry for building 32-bit exe on 64-bit system

[Glenn Morris <rgm@gnu.org>]

I suggest adding something like the following to etc/PROBLEMS and
etc/TODO. I not infrequently want to compile 32-bit apps on 64-bit
systems (so that they can be run on otherwise identical 64- and 32-bit
systems).



*** PROBLEMS    16 Dec 2006 14:00:15 -0000 1.202
--- PROBLEMS    9 Jan 2007 01:39:51 -0000
***************
*** 2355,2360 ****
--- 2355,2366 ----
  the problem, install the current version of GNU Sed, then rerun
  Emacs's configure script.
  
+ *** Building a 32-bit executable on a 64-bit GNU/Linux architecture fails.
+ 
+ For example, if CFLAGS=-m32 is passed to configure, the resulting
+ build will fail.  There is no fix for this problem at present - when
+ building on a 64-bit platform, you must build a 64-bit executable.
+ 
  *** Building the Cygwin port for MS-Windows can fail with some GCC
      version
  
  Building Emacs 22 with Cygwin builds of GCC 3.4.4-1 and 3.4.4-2 is


*** TODO   2 Jan 2007 18:29:37 -0000   1.137
--- TODO   9 Jan 2007 01:40:09 -0000
***************
*** 159,164 ****
--- 159,167 ----
  
  * Other features we would like:
  
+ ** Make it possible to build a 32-bit executable on 64-bit systems.
+   See http://lists.gnu.org/archive/html/emacs-pretest-bug/2006-10/msg00462.html
+ 
  ** Remove the default toggling behavior of minor modes when called from elisp
  rather than interactively.  This a trivial one-liner in easy-mode.el.
  ** Create a category of errors called `user-error' for errors which are