configure.in: s/AC_AIX/AC_USE_SYSTEM_EXTENSIONS/

configure

 #! /bin/sh
-# From configure.in Revision: 80449 .
+# From configure.in Revision: 80474 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.65 for python 3.2.
 #
@@ -4581,7 +4581,6 @@ $as_echo "$ac_cv_safe_to_define___extensions__" >&6; }
 
 
 
-
 # Check for unsupported systems
 case $ac_sys_system/$ac_sys_release in
 atheos*|Linux*/1*)

configure.in

@@ -500,7 +500,7 @@ fi
 
 
 # checks for UNIX variants that set C preprocessor variables
-AC_AIX
+AC_USE_SYSTEM_EXTENSIONS
 
 # Check for unsupported systems
 case $ac_sys_system/$ac_sys_release in