Add Linux (x64) support: presets and POSIX port#31

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LelandJin wants to merge 4 commits into

carbonengine:mainfrom

LelandJin:linux-support

Commits on Jul 15, 2026

Add Linux (x64) support
LelandJin
committed
Preserve share-mode locking on platforms without O_EXLOCK/O_SHLOCK
LelandJin
committed
Fix sem_timedwait timeout being treated as relative time
LelandJin
committed
Fix building with WITH_TELEMETRY=OFF
LelandJin
committed