modules that will work with more than one version of the apache web server
to not require a separate package for each version of apache. This was
originally based on java-vm.mk
Makefile variables added:
PKG_APACHE_ACCEPTED : Contains the list of valid versions of apache.
USE_APR : If set, the package required apr to run.
User variabled added:
PKG_APACHE_DEFAULT : The version of apache to install, if there is
none yet. Defaults to apache13
Variables set:
PKG_APACHE : Which version of apache is being used.