build-sys: move systemd.pc from pkgconfiglibdir back into pkgconfigdatadir The original idea of systemd.pc was to contain arch-independent system and systemd information. By exposing libdir as part of the fields (added in eb39a6239c631873db62f6a942e6cb3dab0a2db4), it started to carry arch-dependent data, thus breaking multilib systems. It was then moved to pkgconfiglibdir to deal with this (in aec432c6134146e138124c4130be2ee89dca07fa), but actually the right approach is to simply not include libdir in the .pc file at all. THis patch hence more or less reverts both commits again, and moves the .pc file back into pkgconfigdatadir. As alternative for querying the systems primary libdir there's now "systemd-path system-library-arch", hence a more correct alternative exists for querying this variable from the .pc file.

pc: no longer expose exec_prefix in .pc file There's little reason to export this, so let's drop it to minimize the file a bit.

pc: expose more drop-in dirs in the .pc file

pc: export $libdir in the .pc file This is useful for code that tries to figure out the primary arch's $libdir on the local system, given that is different on the various Linuxes.

logind: don't apply RemoveIPC= to system users We shouldn't destroy IPC objects of system users on logout. http://lists.freedesktop.org/archives/systemd-devel/2014-April/018373.html This introduces SYSTEM_UID_MAX defined to the maximum UID of system users. This value is determined compile-time, either as configure switch or from /etc/login.defs. (We don't read that file at runtime, since this is really a choice for a system builder, not the end user.) While we are at it we then also update journald to use SYSTEM_UID_MAX when we decide whether to split out log data for a specific client.

pkg-config: export systemd{system,user}generatordir and catalogdir We export the location of a bunch of directories this way, so it makes sense to add those three. Especially catalogdir is something that we want people to add things to. Note on the naming: the first two are tied closely to systemd itself, so I prefixed them with "systemd". The third one is rather more generic, so no prefix. https://bugs.freedesktop.org/show_bug.cgi?id=67635

rpm: expose preset dir as rpm macro and in systemd.pc

move more main systemd parts to core/