Backport from HEAD:

* buildconf: Ensure that make never regenerates the mod_ssl expression
parser files from the lex/yacc sources.

* buildconf: Clean autoconf cache after running autoconf too.

* build/config.guess, build/config.sub: Remove since buildconf copies
these files from APR.

Reviewed by: trawick, jerenkrantz


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/APACHE_2_0_BRANCH@105211 13f79535-47bb-0310-9956-ffa450edef68