using installed apxs when apr and apache are installed in differentdirectories

[Jeff Trawick]

can somebody confirm my results?

apxs -c mod_foo.c

first breakage is due to libtool referenced from wrong directory (apxs 
looks for libtool in apache's installbuilddir instead of apr's)

once that is fixed, now only Apache includes are found so still nothing 
will compile since we need to find APR includes also