OS X link fix (new servicehost.cpp uses Service, from libmythservicec…

…ontracts)

Undefined symbols:
  "Service::staticMetaObject", referenced from:
      __ZN7Service16staticMetaObjectE$non_lazy_ptr in servicehost.o
     (maybe you meant: __ZN7Service16staticMetaObjectE$non_lazy_ptr)
ld: symbol(s) not found
collect2: ld returned 1 exit status
make[1]: *** [libmythupnp-0.24.0.24.0.dylib] Error 1

mythtv/libs/libmythupnp/libmythupnp.pro

@@ -44,6 +44,7 @@ INCLUDEPATH += ./serializers
 
 DEPENDPATH  += ../libmythbase ..
 LIBS      += -L../libmythbase -lmythbase-$$LIBVERSION
+LIBS      += -L../libmythservicecontracts -lmythservicecontracts-$$LIBVERSION
 
 LIBS += $$EXTRA_LIBS