Ensure bin directory exists

Author: ashmckenzie

Makefile

@@ -101,10 +101,13 @@ make_necessary_dirs:
 
 compile: bin/gitlab-shell bin/gitlab-sshd
 
-bin/gitlab-shell: $(GO_SOURCES)
+bin:
+	mkdir -p bin
+
+bin/gitlab-shell: bin $(GO_SOURCES)
 	go build $(GOBUILD_FLAGS) -o $(CURDIR)/bin ./cmd/...
 
-bin/gitlab-sshd: $(GO_SOURCES)
+bin/gitlab-sshd: bin $(GO_SOURCES)
 	go build $(GOBUILD_FLAGS) -o $(CURDIR)/bin/gitlab-sshd ./cmd/gitlab-sshd
 
 check: