Makefile: handle $GOPATH with a trailing slash

When a $GOPATH contains a trailing slash, the current check for string
equality between the repo root and the computed path does not pass, even
though it should. Passing both sides of the check through `abspath`
makes this check more robust.

Signed-off-by: Steve Kuznetsov <[email protected]>

Author: stevekuznetsov

Makefile

@@ -76,7 +76,7 @@ DOCKER_BUILDKIT=1
 export ACK_GINKGO_DEPRECATIONS := 1.16.4
 
 # Set --output-base for conversion-gen if we are not within GOPATH
-ifneq ($(abspath $(REPO_ROOT)),$(shell go env GOPATH)/src/sigs.k8s.io/cluster-api-provider-aws)
+ifneq ($(abspath $(REPO_ROOT)),$(abspath $(shell go env GOPATH)/src/sigs.k8s.io/cluster-api-provider-aws))
 	GEN_OUTPUT_BASE := --output-base=$(REPO_ROOT)
 else
 	export GOPATH := $(shell go env GOPATH)