elf.c: Remove extraneous paren from core_prpsinfo and core_prpstatus
macros, rename core_prpstatus to core_prstatus. Replace references to
old section "size" member with new "_raw_size" member. Implement
elf_make_empty_symbol, which is now used.
coff-h8300.c, coff-i386.c, coff-i960.c, coff-m68k.c, coff-m88k.c,
coff-mips.c, coff-rs6000.c, cpu-h300.c, elf.c, i386aout.c,
newos3.c, stab-syms.c, syms.c: All these files have had their
#includes altered to point to the new places.
