netserver: Remove duplicate forward declaration

Commit fa142073 added forward
declaration of virNetServerPtr into virnetserver.h even though we are
keeping these in virnetserverprogram.h due to older compilers having
problems with duplicate ones.
Signed-off-by: NMartin Kletzander <mkletzan@redhat.com>

src/rpc/virnetserver.h

@@ -33,8 +33,6 @@
 # include "virobject.h"
 # include "virjson.h"
 
-typedef struct _virNetServer virNetServer;
-typedef virNetServer *virNetServerPtr;
 
 virNetServerPtr virNetServerNew(size_t min_workers,
                                 size_t max_workers,