pp.c: Don't use function call for easy copy

pp.c: Don't use function call for easy copy

This code is adding the UTF-8 for a Greek character to a string.  It
previously used Copy, but this character is representable as two bytes
in both ASCII and EBCDIC UTF-8, the only character sets that Perl will
ever supports, so we can use the specialized code that is used most
everywhere else for two byte UTF-8 characters, avoiding the function
overhead, and having to treat this character as particularly special.