Merge pull request #3900 from Azure/kimorris27/hotfix-mockgen-codesign-issue-on-macos

Quickfix - codify solution to another `make generate` issue on MacOS

Makefile

@@ -347,6 +347,10 @@ xmlcov: $(GOCOV) $(GOCOV_XML)
 .PHONY: install-tools
 install-tools: $(BINGO)
 	$(BINGO) get -l
+# Fixes https://github.com/uber-go/mock/issues/185 for MacOS users
+ifeq ($(shell uname -s),Darwin)
+	codesign -f -s - ${GOPATH}/bin/mockgen
+endif
 
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