Currently the pc file has includedir hard coded to "/usr/include" and
libdir to "/usr/lib". This commit changes this so they can be controlled
via the "prefix" variable.

Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

* make sure contrib stuff gets built and installed
* refresh patches and improve Makefile while at it

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

* convert package build to use host-build for ecpg, pg_config and zic
 * introduce /lib/functions/postgresql.sh to be used by packages
   requiring a postgres database to exist as well as postgres' init
 * no longer require shadow-su, patch pg_ctl to setuid() ifself instead
 * auto-create database directory if there is enough free space
 * auto-create databases configured in UCI
 * remove some dead uci config options
 * grab maintainership

Signed-off-by: Daniel Golle <daniel@makrotopia.org>