dlopen issues in 2.1.10

[Alan DeKok]

John Dennis wrote:
> I finally tracked this down and since it affects other people building
> 2.1.10 I thought I would pass along the info. Alan please also note
> there is a git formatted patch attached against the v2.1.x git branch
> and I think you also need to run autogen.sh again (see below).

  OK.  I've added the "autogen" patch, and regenerated autoconf.h.in.

  The fixes for HAVE_HAVE... were already in configure.in for the v2.1.x
branch.

  Alan DeKok.