gh-115806: Don't mangle output of configure 'ipv6 stack type' check (#116165)

Author: erlend-aasland

configure

@@ -4516,7 +4516,6 @@ ipv6lib=none
 ipv6trylibc=no
 
 if test "$ipv6" = yes -a "$cross_compiling" = no; then
-	AC_MSG_CHECKING([ipv6 stack type])
 	for i in inria kame linux-glibc linux-inet6 solaris toshiba v6d zeta;
 	do
 		case $i in
@@ -4579,6 +4578,7 @@ if test "$ipv6" = yes -a "$cross_compiling" = no; then
 			break
 		fi
 	done
+	AC_MSG_CHECKING([ipv6 stack type])
 	AC_MSG_RESULT([$ipv6type])
 fi