committing the placeholder for NSS_CO_TAG so we don't forget to pull it.

a=leaf

client.mak

@@ -43,6 +43,7 @@ MOZ_OBJDIR = WIN32_O.OBJ
 #MOZ_BRANCH=SeaMonkey_M17_BRANCH
 #NSPR_CO_TAG=SeaMonkey_M17_BRANCH
 #PSM_CO_TAG=SeaMonkey_M17_BRANCH
+#NSS_CO_TAG=SeaMonkey_M17_BRANCH
 #LDAPCSDK_CO_TAG=SeaMonkey_M17_BRANCH
 #ACCESSIBLE_CO_TAG=SeaMonkey_M17_BRANCH
 #IMGLIB2_CO_TAG=SeaMonkey_M17_BRANCH