Make sure that all <ctype.h> routines are called with unsigned char

Tom Lane <tgl@sss.pgh.pa.us>

Commit: ee051baeac9dce2dbfd5da50da21ae425b548c43
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2001-12-30T23:09:42Z
Releases: 7.2.1
Make sure that all <ctype.h> routines are called with unsigned char
values; it's not portable to call them with signed chars.  I recall doing
this for the last release, but a few more uncasted calls have snuck in.

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