lib/locale.t: IBM code page 924 locales are broken on z/OS

IBM products tend to view NBSP as both space and graphic; a violation of
the POSIX standard.  There is code in handy.h to compensate for this.
But locales using code page 924 are outliers, and that general code for
the platform doesn't work for them, so add them to the known bad list.

(IBM-924 is an EBCDIC version of Latin-9, ISO 8859-15)

Author: khwilliamson

lib/locale.t

@@ -150,6 +150,11 @@ my %known_bad_locales = (
                           darwin => qr/ ^ lt_LT.ISO8859 /ix,
                           netbsd => qr/\bISO8859-2\b/i,
 
+                          # NBSP is considered graphical in this locale, and
+                          # not a \s.  Other IBM code pages have it be both,
+                          # and handy.h handles that case.
+                          os390 => qr/ IBM-924 /ix,
+
                           # This may be the same bug as the cygwin below; it's
                           # generating malformed UTF-8 on the radix being
                           # mulit-byte