It is easier to re-run configure's test and pick up the cached values

It is easier to re-run configure's test and pick up the cached values
than it is to replicate them in our own macros.  This isn't too expensive
because CC and CPP have already been set by APR.  Too bad it generates
a lot of output.

Also, we don't need to repeat command-line options that are already being
handled by APR now that we use APR's generated flags.  The switches are
still usable on the command-line.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@89092 13f79535-47bb-0310-9956-ffa450edef68