mod_cache cleanup:

change the module variable from tcache_module to cache_module

clear up various gcc warnings

don't segfault when the silly user (me) configures CACHE_OUT
manually


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@90579 13f79535-47bb-0310-9956-ffa450edef68