Don't ignore weak symbols.

EGCS assign weak symbols to inline functions it couldn't inline (e.g. virtual
inline functions), template functions, etc. Omitting them result in quite bogus
profile.

Weak symbols created by __weak_reference are not really problem.

Caught by:	Ilya Segalovich <iseg@comptek.ru>

usr.bin/gprof/elf.c

@@ -97,7 +97,6 @@ wantsym(const Elf_Sym *sym, const char *strtab)
     bind = ELF_ST_BIND(sym->st_info);
 
     if (type != STT_FUNC ||
-      bind == STB_WEAK ||
       (aflag && bind == STB_LOCAL) ||
       (uflag && strchr(strtab + sym->st_name, '.') != NULL))
 	return 0;