Pin version of ltag for go <= v1.15 compatibility

Signed-off-by: Mathis Joffre <[email protected]>

Author: Joffref

Makefile

@@ -122,8 +122,7 @@ $(FC_TEST_BIN_PATH)/tc-redirect-tap:
 	go get github.com/awslabs/tc-redirect-tap/cmd/tc-redirect-tap
 
 $(FC_TEST_DATA_PATH)/ltag:
-	GO111MODULE=off GOBIN=$(abspath $(FC_TEST_DATA_PATH)) \
-	go get github.com/kunalkushwaha/ltag
+	@if [ `go version | cut -d '.' -f 2` -le 15  ]; then GO111MODULE=on GOBIN=$(abspath $(FC_TEST_DATA_PATH)); go get github.com/kunalkushwaha/[email protected]; else GO111MODULE=off GOBIN=$(abspath $(FC_TEST_DATA_PATH)); go get github.com/kunalkushwaha/ltag; fi
 
 $(FIRECRACKER_DIR):
 	- git clone https://github.com/firecracker-microvm/firecracker.git $(FIRECRACKER_DIR)