revert r1294936, which fixed MPM DSO load failures on AIX

it breaks the Netware build and was also missing the 
AP_DECLARE* decorations for the function implementations and
variables


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1301277 13f79535-47bb-0310-9956-ffa450edef68