config/3958: configure silently ignores "--enable-XXX" options where XXX is unknown

[Olly Betts <ol...@muscat.co.uk>]

>Number:         3958
>Category:       config
>Synopsis:       configure silently ignores "--enable-XXX" options where XXX is unknown
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    apache
>State:          open
>Class:          sw-bug
>Submitter-Id:   apache
>Arrival-Date:   Wed Feb 24 04:10:00 PST 1999
>Last-Modified:
>Originator:     olly@muscat.co.uk
>Organization:
apache
>Release:        1.3.4
>Environment:
Solaris 2.6
>Description:
If I mistype:

./configure --enable-module=mod-speling

as:

./configure --enable-modules=mod-speling

I get no error, but apache builds without mod-speling.  In fact --enable-XXX
is ignored if XXX is unknown.  I think this deserves an error message to avoid
the pitfall of mis-spelling a --enable-XXX option and having it ignored.

There are similar issues for --disable-XXX.
>How-To-Repeat:
./configure --enable-modules=mod-speling
>Fix:
Add a "*)" catch-all to report this error at lines 711 and 769 of configure.
>Audit-Trail:
>Unformatted:
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