make: GOFLAGS missing when building cmctl and kubectl_cert-manager
make: GOFLAGS missing when building cmctl and kubectl_cert-manager

The GOFLAGS make variable was set after "include make/cmctl.mk",
leading to the warning:

    Makefile:34: warning: undefined variable 'RELEASE_VERSION'
    Makefile:34: warning: undefined variable 'GITCOMMIT'

Signed-off-by: Maël Valais <d58a90d9f168821bded9222e523244d2fab951f8@vls.dev>

cert-manager/cert-manager,cert-manager/cert-manager,jetstack/cert-manager,jetstack/cert-manager,cert-manager/cert-manager,jetstack/cert-manager