document ms compiler problems with placement delete

src/ca/syncGroupReadNotify.cpp

@@ -94,8 +94,13 @@ void syncGroupReadNotify::show ( unsigned level ) const
 
 void syncGroupReadNotify::operator delete ( void * p )
 {
-    throw std::logic_error 
-        ( "compiler is confused about placement delete" );
+    // Visual C++ .net appears to require operator delete if
+    // placement operator delete is defined? I smell a ms rat
+    // because if I declare placement new and delete, but
+    // comment out the placement delete definition there are
+    // no undefined symbols.
+    errlogPrintf ( "%s:%d this compiler is confused about placement delete - memory was probably leaked",
+        __FILE__, __LINE__ );
 }
 
 void * syncGroupReadNotify::operator new ( size_t size,