package/dovecot: Adjust LIBDOVECOT in dovecot-config to STAGING_DIR
Fixes
http://autobuild.buildroot.net/results/3e6/
3e6c258d7636fedbb87ba62069094291666e6a85/
http://autobuild.buildroot.net/results/410/
410b68afece06ddb03a00245cfdc3de4d9a4e5f1/
http://autobuild.buildroot.net/results/bd3/
bd37ee92eeb00adb1558dbb61315465a0cdfe635/
http://autobuild.buildroot.net/results/fd1/
fd18c3678eded431476b4e61a10c48e160ffd51a//
and many others
Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>