Switch to using aplibtool for building under OS/2 & add support for building

loadable modules as OS/2 DLLs.
PR:
Obtained from:
Submitted by:
Reviewed by:


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@88645 13f79535-47bb-0310-9956-ffa450edef68