powerpc: modules: implement stubs for ELFv2 ABI.

ELFv2 doesn't use function descriptors, because it doesn't need to
load a new r2 when calling into a function.  On the other hand, you're
supposed to use a local entry point for R_PPC_REL24 branches.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

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