Two patches from Mark Grondona (with corrections).

First patch to x_ac_debug.m4:

 "I noticed a bit ago that ./configure --enable-debug has been broken
  in SLURM for awhile -- it does not append "-Wall" to builds.
  
  This patch fixes the problem in x_ac_debug.m4."

Second patch, "fix-compile-warnings.patch", cleans up alot of warnings
revealed by the first patch.  I needed to clean up the patch because it
removed some variables and labels that were used within #ifdef sections.