Revert reloc howto nits

Revert reloc howto nits

The "HOWTO size encoding" patch put 1 as the HOWTO size arg for
numerous howtos that are unused, describe dynamic relocs, are markers,
or otherwise are special purpose reloc howtos that don't care about
the size.  The idea was to ensure no howto changed by inspecting
object files.  Revert those changes, making them zero size.

	* coff-alpha.c: Give special purpose reloc howtos a size of zero.
	* coff-mcore.c, * elf-hppa.h, * elf-m10300.c, * elf32-arm.c,
	* elf32-csky.c, * elf32-m32c.c, * elf32-m68k.c, * elf32-mep.c,
	* elf32-mips.c, * elf32-ppc.c, * elf32-rx.c, * elf32-s390.c,
	* elf32-spu.c, * elf32-tic6x.c, * elf32-tilepro.c, *elf32-vax.c,
	* elf32-xtensa.c, * elf64-alpha.c, * elf64-mips.c,
	* elf64-mmix.c, * elf64-ppc.c, * elf64-s390.c, * elfn32-mips.c,
	* elfxx-loongarch.c, * elfxx-riscv.c, * elfxx-sparc.c,
	* elfxx-tilegx.c, * som.c, * vms-alpha.c: Likewise.