Merge: Use gnulib's alloca-opt module.

diff --cc ChangeLog
index e523175936e1b0f385fdca766704bf1be1d0364a,c3b34d66c140831e9d5481811019b53af0395538..9b8e5f762f33e873921b6a20f77ab946485eaa0a
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 -2011-06-21  Paul Eggert  <eggert@cs.ucla.edu>
++2011-06-22  Paul Eggert  <eggert@cs.ucla.edu>
+ 
+       Use gnulib's alloca-opt module.
+       * .bzrignore: Add lib/alloca.h.
+       * Makefile.in (GNULIB_MODULES): Add alloca-opt.
+       * configure.in (AC_FUNC_ALLOCA): Remove almost all the alloca stuff,
+       as gnulib now does that for us.  Put alloca check in config.h.
+       Include <alloca.h> before any other include file, for AIX 3.
+       * lib/gnulib.mk, m4/gl-comp.m4: Regenerate.
+       * lib/alloca.in.h, m4/alloca.m4: New files, from gnulib.
+ 
  2011-06-21  Leo Liu  <sdl.web@gmail.com>
  
        * m4/sha256.m4: