Minor fixes for firehose and mod_policy:

- err.h does not exist in Solaris. Judging
  from the expected content of err.h we don't
  use it at all, so remove inclusion of it.
- The name DEFAULT_TYPE is to generic. Use
  POLICY_DEFAULT_TYPE instead.
- Include apr header files from configured
  path instead of system path.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1239027 13f79535-47bb-0310-9956-ffa450edef68