powerpc/elfinterp.c: Powerpc works now. Major rework; most relocs

powerpc/elfinterp.c: Powerpc works now.  Major rework; most relocs
  should work now.  R_PPC_JMP_SLOT correctly being lazily relocated.
hash.h: Added a field in elf_resolve to store a ppc-specific address.
boot1.c: Added debugging code.  Disabled check that fails on powerpc
  because the string literal requires a reloc that isn't performed.
  Added check to ignore d_tag if it is out of bounds, as has been
  observed with powerpc binaries.