plpgsql: make WHEN OTHERS distinct from WHEN SQLSTATE '00000'.

The catchall exception condition OTHERS was represented as
sqlerrstate == 0, which was a poor choice because that comes
out the same as SQLSTATE '00000'.  While we don't issue that
as an error code ourselves, there isn't anything particularly
stopping users from doing so.  Use -1 instead, which can't
match any allowed SQLSTATE string.

While at it, invent a macro PLPGSQL_OTHERS to use instead of
a hard-coded magic number.

While this seems like a bug fix, I'm inclined not to back-patch.
It seems barely possible that someone has written code like this
and would be annoyed by changing the behavior in a minor release.

Reported-by: David Fiedler <david.fido.fiedler@gmail.com>
Author: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/CAHjN70-=H5EpTOuZVbC8mPvRS5EfZ4MY2=OUdVDWoyGvKhb+Rw@mail.gmail.com

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