Reenable semaphore support for NetBSD and OpenBSD in syncobjs unit

packages/fcl-base/src/syncobjs.pp

@@ -14,7 +14,7 @@
 {$mode objfpc}
 {$h+}
 
-{$IF DEFINED(WINCE) or DEFINED(AIX) or DEFINED(NETBSD) or DEFINED (OPENBSD)}
+{$IF DEFINED(WINCE) or DEFINED(AIX)}
 {$DEFINE NO_SEMAPHORE_SUPPORT}
 {$ENDIF}