sys/crypo: fix function declarations

In #1119 old-style function declarations are exterminated and forbidden.
I missed the functions in `sys/crypto` because they weren't used
throughout the tests/examples before #1124.
Merge pull request #1170 from Kijewski/fixup-1119-1124

sys/crypo: fix function declarations
examples: added README.md to ipc_pingpong example
added iot-lab_M3 and temporarily dropped telosb support; split patch.txt
into separate patch files
examples: adjusted output and README for IPC pingpong
Merge pull request #1056 from thomaseichinger/pkg-openwsn

pkg: openwsn: update with iot-lab_M3 support and split patch files
examples: IPC ping-pong README adjustments
Merge pull request #1171 from haukepetersen/example_ipcpingpong_readme

examples: added README.md to ipc_pingpong example
native: fixup #1145: function declaration
Merge pull request #1172 from Kijewski/fixup-166b88f1

native: fixup #1145: function declaration
make: put buildtest goals into an own file

`Makefile.include` is too long as is.
make: delete everything in buildtest beforehand
make: supply `-j` on `buildtest`

We support `make -j` for a while now. `make buildtest` takes ages to
finish. So just supply `-j` on buildtest.