Fix harmless excessive verbosity of Cuckoo executables build [Finishes #152955038]
Fix harmless excessive verbosity of Cuckoo executables build [Finishes #152955038]

* Prevent checking out git repo apart from first clone, in order not
  to affect timestamps unnecessarily;

* Use order-only prerequisites for required folders -
  i.e. `c_src/.git`, `priv/bin` and `priv/lib` - in order not to
  recompute targets unnecessarily;

* Silence `make` and `make all`. Thanks to Hans Svensson.

Target
[`.LOW_RESOLUTION_TIME`](https://www.gnu.org/software/make/manual/html_node/Special-Targets.html)
is not needed at least on OSX but is added for preventing potential
unnecessary output on certain filesystems.

aeternity/epoch,aeternity/epoch,aeternity/epoch,aeternity/epoch