Fix the configuration process. If no modules are specified in a given

directory, then that directory is no longer added to the build process.
Also, I have added a .cvsignore to the file_cache directory and removed
a generated file from this directory.  Finally, I have removed
some unnecessary checks from the config.m4 files.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@85561 13f79535-47bb-0310-9956-ffa450edef68