The macOS fsm-ipc-darwin.c is applicable to other Unix variants as
well. Rename it to fsm-ipc-unix.c and add a worktree NULL check
(BUG guard) that was missing from the macOS version.
To support this, introduce FSMONITOR_OS_SETTINGS which is set to
"unix" for both macOS and Linux, distinct from FSMONITOR_DAEMON_BACKEND
which remains platform-specific (darwin, linux, win32). Move
fsm-path-utils from FSMONITOR_OS_SETTINGS to FSMONITOR_DAEMON_BACKEND
since the path-utils files are platform-specific.
Signed-off-by: Paul Tarjan <github@paulisageek.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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