merge this from 2.1-dev:

  Fix a problem that caused httpd to be linked with incorrect flags
  on some platforms when mod_so was enabled by default, breaking
  DSOs on AIX.

PR:                 19012
Reviewed by:	    nd, stoddard


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/APACHE_2_0_BRANCH@99792 13f79535-47bb-0310-9956-ffa450edef68