Fix revno 1831.1.13 as i forget to add the definition to config.h.in

[cmdline/apt-get.cc] check for availability ofstatfs.f_type
Patch from Robert Millan, thanks! (Closes: #509313)

buildlib/config.h.in

@@ -22,6 +22,7 @@
 /* These two are used by the statvfs shim for glibc2.0 and bsd */
 /* Define if we have sys/vfs.h */
 #undef HAVE_VFS_H
+#undef HAVE_STRUCT_STATFS_F_TYPE
 
 /* Define if we have sys/mount.h */
 #undef HAVE_MOUNT_H