* configure.in: Define MKINSTALLDIRS and INSTALL in config_vars.mk.

Don't use AC_PROG_INSTALL since any system "install" command is never
used anyway.

* build/rules.mk.in: Remove fixed reference to install.sh and mkdir.sh
in abs_srcdir.

* build/config_vars.sh: Munge definitions of MKINSTALLDIRS and INSTALL
to use installed scripts.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@190396 13f79535-47bb-0310-9956-ffa450edef68