Remove the ability to enable/disable DSO support in APR. The only current

way to check for DSO support is to look for libdl.  Apache automatically
adds -ldl to it's LIBS flag from config.m4 in modules/standard.  Other
platforms will need to add the correct flag for their system.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@85432 13f79535-47bb-0310-9956-ffa450edef68