Auto-detect and link libsystemd at compile-time
This adds Makefile/build-system support for USE_SYSTEMD=(yes|no|*). This variable's value determines whether or not libsystemd will be linked at build-time. If USE_SYSTEMD is set to "yes", make will use PKG_CONFIG to check for libsystemd's presence, and fail the build early if it isn't installed/detected properly. If USE_SYSTEM is set to "no", libsystemd will *not* be linked, even if support for it is available on the system redis is being built on. For any other value that USE_SYSTEM might assume (e.g. "auto"), PKG_CONFIG will try to determine libsystemd's presence, and set up the build process to link against it, if it was indicated as being installed/available. This approach has a number of repercussions of its own, most importantly the following: If you build redis on a system that actually has systemd support, but no libsystemd-dev package(s) installed, you'll end up *without* support for systemd notification/status reporting support in redis-server. This changes established runtime behaviour. I'm not sure if the build system and/or the server binary should indicate this. I'm also wondering if not actually having systemd-notify-support, but requesting it via the server's config, should result in a fatal error now.
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