Enable globstar option when running bash commands

`clean-bin` target does not clean the `./bin` directory otherwise

Makefile

@@ -1,7 +1,7 @@
 # Setting SHELL to bash allows bash commands to be executed by recipes.
 # This is a requirement for 'setup-envtest.sh' in the test target.
 # Options are set to exit when a recipe line exits non-zero or a piped command fails.
-SHELL = /usr/bin/env bash -o pipefail
+SHELL = /usr/bin/env bash -o pipefail -O globstar
 .SHELLFLAGS = -ec
 
 ##@ General