Improve the exports generating awk script. In the past, we had

work around problems in the awk script by avoiding some #if and
#ifdefs.  This has bitten us many times in generating the exports.c
file.  This improvement allows corrects the header file parsing.

Submitted by:	Sander Striker <striker@apache.org>


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@89647 13f79535-47bb-0310-9956-ffa450edef68