[HEIMDAL-646] aix

AIX qsort() is unstable and might change the order of the elements
if they are equal, libwind require them to be in the same order as they were
on the input, pull in FreeBSD qsort and use that instead of AIX version.

cf/aix.m4

@@ -9,7 +9,7 @@ case "$host" in
 *-*-aix3*)
 	aix=3
 	;;
-*-*-aix[4-9]*)
+*-*-aix[[4-9]]*)
 	aix=4
 	;;
 esac
@@ -17,12 +17,14 @@ esac
 AM_CONDITIONAL(AIX, test "$aix" != no)dnl
 AM_CONDITIONAL(AIX4, test "$aix" = 4)dnl
 
-
 AC_ARG_ENABLE(dynamic-afs,
 	AS_HELP_STRING([--disable-dynamic-afs],
 		[do not use loaded AFS library with AIX]))
 
 if test "$aix" != no; then
+
+	AC_DEFINE(NEED_QSORT, 1, [if your qsort is not a stable sort])
+
 	if test "$enable_dynamic_afs" != no; then
 		AC_REQUIRE([rk_DLOPEN])
 		if test "$ac_cv_func_dlopen" = no; then