Replacement solution to identify VCHAR/ASCII symbols, even in EBCDIC.

Looking for someone with an EBCDIC environment to post the output of
the test_char.h generated file for verification.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1754579 13f79535-47bb-0310-9956-ffa450edef68