Regenerated autoconf files. There's an extra change to config.h.in beyond

the mremap() change I made; did someone modify configure.in previously
without recreating these files?

config.h.in

@@ -360,6 +360,9 @@
 /* Define if you have the mktime function.  */
 #undef HAVE_MKTIME
 
+/* Define if you have the mremap function.  */
+#undef HAVE_MREMAP
+
 /* Define if you have the nice function.  */
 #undef HAVE_NICE
 
@@ -528,6 +531,9 @@
 /* Define if you have the <sys/select.h> header file.  */
 #undef HAVE_SYS_SELECT_H
 
+/* Define if you have the <sys/socket.h> header file.  */
+#undef HAVE_SYS_SOCKET_H
+
 /* Define if you have the <sys/time.h> header file.  */
 #undef HAVE_SYS_TIME_H