* config/obj-elf.c: Standardize error/warning messages - don't

	* config/obj-elf.c: Standardize error/warning messages - don't
	capitalise, no final period or newline, don't say "ignoring" for
	as_bad messages.  In some cases, change the wording to that used
	elsewhere for similar messages.
	(obj_elf_section_name): New function, split out from ..
	(obj_elf_section): .. here.  Correctly mask off SHF_MERGE if
	entsize not specified.