* symbols.c: Replace CONST by const throughout.

	* symbols.c: Replace CONST by const throughout.
	(symbol_find_exact): Split out from..
	(symbol_find_base): ..here.
	* symbols.h: Replace CONST by const throughout.
	(symbol_find_exact): Declare.
	* config/obj-elf.c: #include "struc-symbol.h".
	(elf_frob_file): If group name matches an exported symbol, use that
	symbol for the signature and ".group" as the section name.