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Don't use EBCDIC macro for a C language escape
C recognizes '\a' (for BEL); just use that instead of a look-up.
regen/unicode_constants.pl could be used to generate the character for
the ESC (set in nearby code), but I didn't do that because of
potential bootstrapping problems when porting to an EBCDIC platform
without a working perl. (The other characters generated in that .pl are
less likely to cause problems when compiling perl.)