[libc++][AIX] Fixup problems with ABI list checking (#155643) There are some problems with our ABI list checking exposed by recent compiler/cmake upgrades. - For symcheck, there are typos in how XCOFF magic are defined, we intended the second two digits to be a hex value, but our syntax doesn't say that. Thus this will never match a valid XCOFF file. - AIX triples can have version numbers. Those need to be discarded when looking for an libc++ ABI list, like we do for other targets.
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