Fold the compiled-in knowledge of the allowable AcceptMutex settings into

Fold the compiled-in knowledge of the allowable AcceptMutex settings into
its help entry. Requires the use of a extern string rather than a function
call for the initialization to be valid in the macro (Thx to Jeff!).
In the meantime, bump down the error logging until we deal with true
default and configured setting information ala 1.3.

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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@94062 13f79535-47bb-0310-9956-ffa450edef68