build: Add missing tests and gnulib modules suggested by autoscan. * build-aux/bootstrap_gnulib.conf: Add float and stddef header modules. * libgnu/Makefile.am: Automatically re-generated when module list changed. * configure.ac: Add function check for isascii, modf, pow, sqrt. Add function check for chown, ftruncate, mmap, munmap when building GUI. * libinterp/interpfcn/toplev.cc: Add gnulib:: qualifier to malloc call. * liboctave/util/oct-shlib.cc: Add gnulib:: qualifier to strerror call.

--- a/libinterp/interpfcn/toplev.cc	Fri Sep 28 15:04:09 2012 -0400
+++ b/libinterp/interpfcn/toplev.cc	Fri Sep 28 14:22:54 2012 -0700
@@ -1524,11 +1524,11 @@
   /* malloc (0) is unpredictable; avoid it.  */
   if (sz == 0)
     sz = 1;
-  p = malloc (sz);
+  p = gnulib::malloc (sz);
   while (p == 0)
     {
       (*__new_handler) ();
-      p = malloc (sz);
+      p = gnulib::malloc (sz);
     }
 
   if (debug_new_delete)