More build cleanups

-- Pull AC_PROG_OBJC and AC_PROG_OBJCPP from autoconf 2.61, but use the local
   versions only if they're not defined by the version of autoconf in use.
-- Always call AC_PROG_OBJC since there's no harm in doing so.  It'll fail most
   of the time, but it's cleaner than adding yet another $host_os check
-- Remove -DCONFIG_DARWIN from CPPFLAGS since it was added specifically for
   ffmpeg when ffmpeg was built using xine's built infrastructure rather than
   its own.  It's now defined properly where its needed elsewhere.
-- Set host_or_hostalias early rather than later in the middle of xv checking
   since a bunch of other stuff depends on it too.

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