If the user explicitly requests --enable-so, --enable-so=yes,

--enable-so=static, or --enable-so=shared but APR_HAS_DSO is
not defined on their system, then it is a fatal error.

Tested on Solaris, but I think it should work everywhere else.

Feel free to change the error message to something
better/more descriptive/etc.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@91652 13f79535-47bb-0310-9956-ffa450edef68