After lengthy investigation with covener's assistance, it seems we cannot

After lengthy investigation with covener's assistance, it seems we cannot
use a static table. We cannot change this to dynamic use of the local iconv
without build changes to avoid such use on cross-platform builds.

I'm satisfied if we trust iscntrl to at least catch all the most lethal
C0 Ctrls (we are promised it catches bad carriage control/line endings)
and leave this in the short term with an XXX to revisit at a future time.

The token stop never needed this table, because we can use the affirmative
list of token characters to define it.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1756946 13f79535-47bb-0310-9956-ffa450edef68