build: no need to list all go modules

It is not clear why listing all modules is useful. Some modules have
internal versions (Kubernetes modules), and the command reports those as
a warning with an error exit code.

Signed-off-by: Niels de Vos <ndevos@ibm.com>

Author: nixpanic

Makefile

@@ -110,8 +110,6 @@ go-test-api: check-env
 mod-check: check-env
 	@echo 'running: go mod verify'
 	@go mod verify && [ "$(shell sha512sum go.mod)" = "`sha512sum go.mod`" ] || ( echo "ERROR: go.mod was modified by 'go mod verify'" && false )
-	@echo 'running: go list -mod=readonly -m all'
-	@go list -mod=readonly -m all 1> /dev/null
 
 scripts/golangci.yml: scripts/golangci.yml.in
 	rm -f scripts/golangci.yml.buildtags.in