use epicsMutex for Mutex

Now non-copyable, wasn't before...

pvDataApp/misc/lock.h

@@ -15,19 +15,7 @@
 
 namespace epics { namespace pvData { 
 
-class Mutex  {
-public:
-    Mutex() : id(epicsMutexCreate())
-    {if(!id) throw std::bad_alloc();}
-    ~Mutex() { epicsMutexDestroy(id) ;}
-    void lock(){
-        if(epicsMutexLock(id)!=epicsMutexLockOK)
-            throw std::logic_error("Failed to acquire Mutex");
-    }
-    void unlock(){epicsMutexUnlock(id);}
-private:
-    epicsMutexId id;
-};
+typedef epicsMutex Mutex;
 
 class Lock : private NoDefaultMethods {
 public:

pvDataApp/misc/timer.cpp

@@ -64,7 +64,7 @@ public: // only used by this source module
 
 Timer::Pvt::Pvt(String threadName,ThreadPriority priority)
 : timerList(),
-  mutex(Mutex()),
+  mutex(),
   waitForWork(false),
   waitForDone(false),
   alive(true),