build: cleanup build defines for session-tracking
- always define the SESSION_TRACKING_* defines to replace "#ifdef" with "#if". - drop defining the consolekit database path CKDB_PATH in config.h. The path was not customizable via configure/meson. - fix meson build to enable consolekit support for session tracking without also enabling logind/elogind session tracking. logind/elogind is mutually exclusive, but consolekit session tracking goes together just fine.
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