Add ABI_VERSION declaration in order to tell dovecot plugins that are
runtime-dependent on dovecot's Application Binary Interface (ABI)
version, such as the pigeonhole mail filter, that they need to be
rebuilt each time the dovecot's ABI version changes.

This PR is not yet closing issue #5062. A forthcoming PR for pigeonhole
package will close the issue.

Introduce a new configuration parameter to enable ICU (i18n) support.
Make the ICU disabled by default.

Introduce PKG_CONFIG_DEPENDS with the list of configuration parameters
triggering rebuild of dovecot.

Declare the conffiles section to save dovecot's configuration files and
its init.d script on sysupgrade.

Introduce a new package, dovecot-utils, to contain doveadm and dsync
utilities: closes #4912.

Correct the destination directory for the installation of
example-config files. At present, the example files are installed into
/usr/share/doc/dovecot/example-config/example-config.

Signed-off-by: Val Kulkov <val.kulkov@gmail.com>

Signed-off-by: Lucian Cristian <lucian.cristian@gmail.com>

Signed-off-by: Lucian Cristian <lucian.cristian@gmail.com>

Signed-off-by: Lucian Cristian <lucian.cristian@gmail.com>

Signed-off-by: Lucian Cristian <lucian.cristian@gmail.com>

Signed-off-by: W. Michael Petullo <mike@flyn.org>

Signed-off-by: Lucian Cristian <lucian.cristian@gmail.com>

Signed-off-by: Lucian Cristian <lucian.cristian@gmail.com>

Signed-off-by: Lucian Cristian <lucian.cristian@gmail.com>

Signed-off-by: Lucian Cristian <lucian.cristian@gmail.com>

Signed-off-by: Lucian Cristian <lucian.cristian@gmail.com>

Signed-off-by: Lucian Cristian <lucian.cristian@gmail.com>

Signed-off-by: Lucian Cristian <lucian.cristian@gmail.com>

Signed-off-by: Lucian Cristian <lucian.cristian@gmail.com>

Signed-off-by: Lucian Cristian <lucian.cristian@gmail.com>

Signed-off-by: Denis Shulyaka <Shulyaka@gmail.com>

Signed-off-by: Peter Wagner <tripolar@gmx.at>

Signed-off-by: Peter Wagner <tripolar@gmx.at>

recent changes in trunk allow us to specify the userid inside the openwrt makefile.
the info is stored int he meta data of the IPK contorl file and users are generated
by the new generic postinst trigger.

Signed-off-by: John Crispin <blogic@openwrt.org>

Signed-off-by: Peter Wagner <tripolar@gmx.at>

Signed-off-by: W. Michael Petullo <mike@flyn.org>

Signed-off-by: Ian Leonard <antonlacon@gmail.com>

Signed-off-by: Peter Wagner <tripolar@gmx.at>