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Fangrui Song
7f044341f9
In lld linked programs, .rodata comes before .text, thus mrb_ro_data_p will return false for strings in .rodata. Change the lower bound from _etext to __ehdr_start to catch these cases. This works for ld.bfd, gold and lld, and it does not have false positives even if .init_array does not exist. Remove the branch that uses _edata: strings in .data can be modified so this is semantically incorrect. Delete the __APPLE__ branch (its manpages say get_etext() and get_edata() are strongly discouraged). .init_array has been adopted by most ELF platforms to supersede .ctors. Neither _etext nor _edata is used, so rename MRB_USE_ETEXT_EDATA to MRB_USE_EHDR_START.