Fix build without the assistant.

CHANGELOG

@@ -3,6 +3,7 @@ git-annex (10.20250321) UNRELEASED; urgency=medium
   * updatecluster, updateproxy: When a remote that has no annex-uuid is
     configured as annex-cluster-node, warn and avoid writing bad data to
     the git-annex branch.
+  * Fix build without the assistant.
 
  -- Joey Hess <id@joeyh.name>  Fri, 21 Mar 2025 12:27:11 -0400
 

Utility/DirWatcher.hs

@@ -139,7 +139,7 @@ watchDir dir prune scanevents hooks runstartup =
 	runstartup $ Win32Notify.watchDir dir prune scanevents hooks
 #else
 type DirWatcherHandle = ()
-watchDir :: FilePath -> Pruner -> Bool -> WatchHooks -> (IO () -> IO ()) -> IO DirWatcherHandle
+watchDir :: OsPath -> Pruner -> Bool -> WatchHooks -> (IO () -> IO ()) -> IO DirWatcherHandle
 watchDir = error "watchDir not defined"
 #endif
 #endif

doc/bugs/10.20250320_build_error_when_assistant_is_disabled.mdwn

@@ -60,3 +60,5 @@ of the setup in case they turn out to be relevant:
    - `--ghc-options="-j$n +RTS -A256m -RTS -split-sections -optc-Os -optl=-pthread"`
 
    Full setup is at <https://git.kyleam.com/static-annex/>.
+
+> [[fixed|done]] --[[Joey]]