From David Callu, warning fixes and removal of spaces at end of lines.

src/osg/Referenced.cpp

@@ -110,6 +110,8 @@ void Referenced::setThreadSafeReferenceCounting(bool enableThreadSafeReferenceCo
 {
 #if !defined(_OSG_REFERENCED_USE_ATOMIC_OPERATIONS)
     s_useThreadSafeReferenceCounting = enableThreadSafeReferenceCounting;
+#else
+    OSG_UNUSED(enableThreadSafeReferenceCounting);
 #endif
 }
 
@@ -182,8 +184,12 @@ Referenced::Referenced(bool threadSafeRefUnref):
 #if !defined(_OSG_REFERENCED_USE_ATOMIC_OPERATIONS)
 #ifndef ENFORCE_THREADSAFE
     if (threadSafeRefUnref)
+#else
+    OSG_UNUSED(threadSafeRefUnref);
 #endif
         _refMutex = new OpenThreads::Mutex;
+#else
+    OSG_UNUSED(threadSafeRefUnref);
 #endif
 
 #ifdef DEBUG_OBJECT_ALLOCATION_DESTRUCTION
@@ -347,6 +353,8 @@ void Referenced::setThreadSafeRefUnref(bool threadSafe)
             delete tmpMutexPtr;
         }
     }
+#else
+    OSG_UNUSED(threadSafe);
 #endif
 }