Add a few missing elocations.

ok jasper@

Adjust some PPC ELF code to return -1 instead of doing pointer
arithmetics on NULL, like we did in r1.21 on elflink.c, to stop
clang from complaining when setting up a cross-toolchain.

ok kettenis@

Here comes the easter bunnytils 2.17 (the last version released against a
licence mere mortals can understand the terms of); will be connected to the
build on an arch-by-arch basis.

Testsuites and g

Here comes the easter bunnytils 2.17 (the last version released against a
licence mere mortals can understand the terms of); will be connected to the
build on an arch-by-arch basis.

Testsuites and generated files have been intentionnaly omitted from this import.

Peer pressure and ok from at least drahn@ pirofti@ deraadt@

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