Update wiringpi to latest revision. Due to a refactoring of the build
procedure in wiringpi the integration patch 'makefile-install.patch'
didn't apply anymore. While migrating that patch it was simplified and
generated using 'git format-patch' instead, to make it easier to maintain
the patch in the future.
[Support #60]
Signed-off-by: Petter Mabäcker <petter@technux.se>
Acked-by: Andrei Gherzan <andrei@gherzan.ro>