virnetdevmacvlan: Provide stubs for build without macvtap

In 370608b4 we have introduced two new internal APIs.
However, there are no stubs for build without macvtap. Therefore
build on systems lacking macvtap support (e.g. mingw or freebds)
fails when trying to link.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

src/util/virnetdevmacvlan.c

@@ -1330,4 +1330,19 @@ int virNetDevMacVLanVPortProfileRegisterCallback(const char *ifname ATTRIBUTE_UN
                          _("Cannot create macvlan devices on this platform"));
     return -1;
 }
+
+int virNetDevMacVLanReleaseName(const char *name ATTRIBUTE_UNUSED)
+{
+    virReportSystemError(ENOSYS, "%s",
+                         _("Cannot create macvlan devices on this platform"));
+    return -1;
+}
+
+int virNetDevMacVLanReserveName(const char *name ATTRIBUTE_UNUSED,
+                                bool quietFail ATTRIBUTE_UNUSED)
+{
+    virReportSystemError(ENOSYS, "%s",
+                         _("Cannot create macvlan devices on this platform"));
+    return -1;
+}
 #endif /* ! WITH_MACVTAP */