move Util_mutex to client

src/client/bounded_queue_sync.ml

@@ -28,7 +28,7 @@ module Q : sig
       number of items that could not be pushed, and [old_size] is the size
       before anything was pushed. *)
 end = struct
-  module UM = Opentelemetry_util.Util_mutex
+  module UM = Util_mutex
 
   type 'a t = {
     mutex: Mutex.t;

src/client/dune

@@ -9,6 +9,7 @@
   opentelemetry.proto
   opentelemetry.domain
   pbrt
+  threads.posix
   mtime
   mtime.clock.os)
  (synopsis

src/client/sync_queue.ml

@@ -1,4 +1,4 @@
-module UM = Opentelemetry_util.Util_mutex
+module UM = Util_mutex
 
 type 'a t = {
   mutex: Mutex.t;