librc, rc, supervise-daemon: Repace hardcoded paths with function calls. #752
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This lays the groundwork for other features like user services, or a different root prefix, by allowing us to change where openrc looks up for files at runtime.
As a side effect of this change, now all sysconfdirs (aka RC_PKG_PREFIX and RC_LOCAL_PREFIX) are checked for configuration files (rc.conf and rc.conf.d).
This is the first of three patches for openrc-user support.
I am unsure about the api for rc_sysconf_dir, however, an RC_STRINGLIST would be more idiomatic to the codebase, but at the same time, the current NULL terminated double pointer allows for avoiding allocations when not necessary