Get FreeBSD 3.4 building again. It doesn't have lib dl, so the build

was broken as of the time we started always sticking in -ldl.

src/modules/standard/config.m4:

. don't add "-ldl" to LIBS for FreeBSD either
. back out previous change regarding LTFLAGS; it should be o.k.
  to add it for any platform, because libtool knows what to do with
  it (no, Greg A., I haven't added support for it to OS/390 libtool
  yet :) )

src/lib/apr/configure.in:

. if dlopen() isn't found in lib dl, don't fret (yet); try to find
  it in the default libraries;


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@85505 13f79535-47bb-0310-9956-ffa450edef68