Tweak a check in ct tests to make it work on Make 3.82
Tweak a check in ct tests to make it work on Make 3.82

Getting:

    Nothing to be done for `ct'

Instead of, in later versions:

    Nothing to be done for 'ct'

Only check for the start of the sentence instead.

jj1bdx/erlang.mk,crownedgrouse/erlang.mk,rabbitmq/erlang.mk,ninenines/erlang.mk