Minor Makefile edit and remove FIXME

Makefile

@@ -7,10 +7,12 @@ version=$(shell ver=$$(git log -n 1 --pretty=oneline --format=%D | awk -F, '{pri
 	echo $$ver)
 
 client: 
+	mkdir build
 	go build -ldflags "-X main.version=${version}" ./cmd/ck-client 
 	mv ck-client* ./build
 
 server: 
+	mkdir build
 	go build -ldflags "-X main.version=${version}" ./cmd/ck-server
 	mv ck-server* ./build
 

internal/multiplex/switchboard.go

@@ -148,17 +148,6 @@ func (sb *switchboard) deplex(ce *connEnclave) {
 			continue
 		}
 
-		// FIXME: there has been a bug in which a packet has
-		// a seemingly corrupted StreamID (e.g. when the largest streamID is something like 3000
-		// and suddently a streamID of 3358661675 is added.
-		// It happens once ~6 hours and the occourance is realy unstable
-		// I couldn't find a way to reproduce it. But I do have some clue.
-		// I commented out the util.genXorKeys function so that the stream headers are being
-		// sent in plaintext, and this bug didn't happen again. So I suspect it has to do
-		// with xxHash. Either it's to do with my usage of the libary or the implementation
-		// of the library. Maybe there's a race somewhere? I may eventually use another
-		// method to encrypt the headers. xxHash isn't cryptographic afterall.
-
 		stream := sb.session.getStream(frame.StreamID, frame.Closing == 1)
 		// if the frame is telling us to close a closed stream
 		// (this happens when ss-server and ss-local closes the stream