Add support for 64-bit symbol lookup tables. #21
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To overcome the 4 GiB file size limit some operating system like Solaris 11.2 and GNU use a variant lookup table. Instead of 32-bit integers, 64-bit integers are used in the symbol lookup tables. The string "/SYM64/" instead "/" is used as identifier for this table¹.
A 32-bit archive symbol table has a zero length name, so ar_name contains the string "/" padded with 15 blank characters on the right. A 64-bit archive symbol table sets ar_name to the string "/SYM64/", padded with 9 blank characters to the right.
Without this fix errors like these are thrown by arpy.