Clean up building with USE_SYSTEMD. (#8073)
When USE_SYSTEMD=yes is specified, try to use pkg-config to determine libsystemd linker flags. If not found, silently fall back to simply using "-lsystemd". We now use a LIBSYSTEMD_LIBS variable so users can explicitly override it and specify their own library. If USE_SYSTEMD is unspecified the old behavior of auto-enabling it if both pkg-config and libsystemd are available is retained.
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