Remove cache implementation, to be discussed and done later

src/nturi.cpp

@@ -148,20 +148,14 @@ bool NTURI::is_a(PVStructurePtr const & pvStructure)
     return is_a(pvStructure->getStructure());
 }
 
-static epicsThreadOnceId cachedResultOnceId = EPICS_THREAD_ONCE_INIT;
-static epicsThreadPrivateId cachedResultId;
-
 bool NTURI::isCompatible(StructureConstPtr const & structure)
 {
     if (!structure)
         return false;
 
-    Result& result = Result::fromCache(&cachedResultOnceId, &cachedResultId);
+    Result result(structure);
 
-    if (result.wraps(structure))
-        return result.valid();
-
-    result.reset(structure)
+    result
         .is<Structure>()
         .has<Scalar>("scheme")
         .has<Scalar>("path")