HOWTO size encoding

HOWTO size encoding

This changes the HOWTO macro to encode the howto.size field from a
value given in bytes.  This of course requires editing all target
uses of HOWTO, a major pain, but makes it a little nicer to specify
new target HOWTOs.  Object files before/after this patch are
unchanged in .data and .rodata.

bfd/
	* reloc.c (HOWTO_RSIZE): Encode size in bytes.
	(EMPTY_HOWTO): Adjust to keep it all zero.
	* aout-ns32k.c, * aoutx.h, * coff-alpha.c, * coff-arm.c,
	* coff-i386.c, * coff-mcore.c, * coff-mips.c, * coff-rs6000.c,
	* coff-sh.c, * coff-tic30.c, * coff-tic4x.c, * coff-tic54x.c,
	* coff-x86_64.c, * coff-z80.c, * coff-z8k.c, * coff64-rs6000.c,
	* elf-hppa.h, * elf-m10200.c, * elf-m10300.c, * elf32-arc.c,
	* elf32-arm.c, * elf32-avr.c, * elf32-bfin.c, * elf32-cr16.c,
	* elf32-cris.c, * elf32-crx.c, * elf32-csky.c, * elf32-d10v.c,
	* elf32-d30v.c, * elf32-dlx.c, * elf32-epiphany.c,
	* elf32-fr30.c, * elf32-frv.c, * elf32-ft32.c, * elf32-gen.c,
	* elf32-h8300.c, * elf32-i386.c, * elf32-ip2k.c, * elf32-iq2000.c,
	* elf32-lm32.c, * elf32-m32c.c, * elf32-m32r.c, * elf32-m68hc11.c,
	* elf32-m68hc12.c, * elf32-m68k.c, * elf32-mcore.c, * elf32-mep.c,
	* elf32-metag.c, * elf32-microblaze.c, * elf32-mips.c,
	* elf32-moxie.c, * elf32-msp430.c, * elf32-mt.c, * elf32-nds32.c,
	* elf32-nios2.c, * elf32-or1k.c, * elf32-pj.c, * elf32-ppc.c,
	* elf32-pru.c, * elf32-rl78.c, * elf32-rx.c, * elf32-s12z.c,
	* elf32-s390.c, * elf32-score.c, * elf32-score7.c,
	* elf32-sh-relocs.h, * elf32-spu.c, * elf32-tic6x.c,
	* elf32-tilepro.c, * elf32-v850.c, * elf32-vax.c,
	* elf32-visium.c, * elf32-wasm32.c, * elf32-xc16x.c,
	* elf32-xgate.c, * elf32-xstormy16.c, * elf32-xtensa.c,
	* elf32-z80.c, * elf64-alpha.c, * elf64-bpf.c, * elf64-gen.c,
	* elf64-mips.c, * elf64-mmix.c, * elf64-nfp.c, * elf64-ppc.c,
	* elf64-s390.c, * elf64-x86-64.c, * elfn32-mips.c,
	* elfnn-aarch64.c, * elfxx-ia64.c, * elfxx-loongarch.c,
	* elfxx-mips.c, * elfxx-riscv.c, * elfxx-sparc.c,
	* elfxx-tilegx.c, * mach-o-aarch64.c, * mach-o-arm.c,
	* mach-o-i386.c, * mach-o-x86-64.c, * pdp11.c, * reloc.c,
	* som.c, * vms-alpha.c: Adjust all uses of HOWTO.
	* bfd-in2.h: Regenerate.
include/
	* elf/arc-reloc.def: Adjust all uses of HOWTO.