Use configure --localstatedir=BASEDIR to set path to /var

Use configure --localstatedir=BASEDIR to set path to /var

This is helpful to test make uninstall with --prefix=/private/dir as
unprivileged user. No change in behaviour is expected by this change.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Cc: Ian Campbell <ian.campbell@citrix.com>
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: Wei Liu <wei.liu2@citrix.com>
[ ijc -- ran autogen.sh as requested ]