* Depend on libelf on DragonFly
* Rework the vdpau support code and enable vdpau for DragonFly, FreeBSD
doesn't support it just yet.
* Revert commit that removed support for non-render nodes. Neither
FreeBSD nor DragonFly supports render nodes at this time.
* Fix LDFLAGS to work with GCC5, which DragonFly uses by default.
* Update Makefile.targets: ffast-math isn't used since 8.0.3, don't
replace x86_64 with amd64 on Dragonfly. Drop obsolete python disable
replace.
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