Switch the executable-owned call sites from the plain dlopen_<lib>() helpers to the new DLOPEN_<LIB>() macros, so that each binary that loads an optional library at runtime now carries its own .note.dlopen note instead of relying solely on libsystemd-shared. Each call site passes a priority reflecting whether it hard-depends on the library (required) or degrades gracefully without it (recommended). Co-developed-by: Claude Opus 4.8 <noreply@anthropic.com>
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