Allow recipe to install rsrc executable

Modules prevent the installation of executables using the standard
`go get` syntax. Using `GOMODULE111=off` should fix this until
[#40276](golang/go#40276) is implemented.

See also:
[#27643](golang/go#27643)
[#30515](golang/go#30515)

[#171660042](https://www.pivotaltracker.com/story/show/171660042)

Co-authored-by: Sebastian Vidrio <svidrio@vmware.com>

Makefile

@@ -183,8 +183,12 @@ out/cf-cli_winx64.exe: $(GOSRC) rsrc.syso
 	rm rsrc.syso
 
 rsrc.syso:
+	@# 'Temporarily' using GOMODULE111 hack: see
+	@# [#27643](https://github.com/golang/go/issues/27643)
+	@# [#30515](https://github.com/golang/go/issues/30515)
+	@# [#40276](https://github.com/golang/go/issues/40276)
 	@# Software for windows icon
-	go get github.com/akavel/rsrc
+	GOMODULE111=off go get github.com/akavel/rsrc
 	@# Generates icon file
 	rsrc -ico cf.ico