Eventually we will want to only find openssl once regardless of how

Eventually we will want to only find openssl once regardless of how
many modules depend on it, so make the check an autoconf macro.
Note that this still isn't being checked "the autoconf way", but it
is better than what we have now.

I'm not sure about the -R stuff, but I am told that Solaris won't
build without it.  This is something that should be tested using
AC_TRY_LINK rather than assuming openssl isn't already on the ld path.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@89063 13f79535-47bb-0310-9956-ffa450edef68