Re: poll_for_input_1 undefined

[Paul Eggert]

I think Richard's problem this time was caused not by clock skew, but 
because 'bzr up' significantly changed the build procedure, and then 'cd 
src; make -k' did not propagate those changes properly.

I took a shot at fixing this and installed the fix as trunk bzr 117526. 
 This fixes only the src subdirectory; I expect lib-src, lisp, and nt 
need similar fixes, but one step at a time.

It is a pain that this build-procedure stuff needs to be semi-copied 
around from one makefile to another.  One possibility to avoid this 
pain, if someone has the time, would be to switch Emacs to a 
non-recursive 'make' style [1], which we've already done in other GNU 
projects (e.g., coreutils) to good effect.  Another possibility would be 
to use Automake.

[1] Miller P. Recursive make considered harmful. AUUGN 1998 
Feb;19(1):14-25. http://aegis.sourceforge.net/auug97.pdf