Implement 8-bit ctype suggestion #2 modified by Roy's (unsigned char)

suggestion because Iain Brown <iain@iain.com> pointed out that my logic
regarding the casting was wrong.  This compiles and runs/works on both
Linux and Solaris 2.6.  I'm totally willing to back it out if there
are complaints, I just figure this is the best way to get widespread
multiplatform testing.

To test you need to request a URL with character 246 (�), and you should
create a .htaccess in a directory with an AddDescription containing
character 246 as well.  (Actually, trying 240 through 255 would be good.)

PR:		800, 2282, 2553  (and others)


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@81673 13f79535-47bb-0310-9956-ffa450edef68