make: add gpio feature
tests/driver_pir: set default GPIO
Merge pull request #1765 from LudwigOrtmann/feature_gpio

make: add gpio feature
Fix oonf_api after destiny to socket_base migration

The include path provided for socket.h did not exist.
Merge pull request #1766 from Lotterleben/oonf_transport_layer

Fix oonf_api after destiny to socket_base migration