6368966 *oawk* and *awk_xpg4* should use wide character equivalent of isalnum()

6272066 gcc and cmd/oawk don't get along
6273850 gcc and cmd/setpgrp don't get along
6273941 gcc and cmd/ul don't get along

6320514 UNIX03/UNIX98 *vsc* awk.ex 35 fails - new test, awk fails on filenames with "=", i.e. x=y

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