Build swift-corelibs-dispatch from tags

They now tag it and everything, it's a miracle

update-tags.sh

@@ -6,7 +6,7 @@ if [ "$SWIFT_TAG" == "master" ]; then
 fi
 
 #projects that have no tag
-NOTAG=("swift-dev" "swift-corelibs-libdispatch")
+NOTAG=("swift-dev")
 for file in `find ../ -maxdepth 1 -type d`; do 
     skip=0
     for n in "${NOTAG[@]}"; do