Mac: Update llqtwebkit build, build and package dylib Qt4 pieces.

Part of the switchover to dynamic Qt4.  This mostly completes the
Mac side.  Webkit is functional on Mac, plugins work.  The two
test programs, llfbconnectest and llplugintest, need a little
more work to run without manual fixup ('.' on PATH and maybe a
symlink to libz.1.dylib and they run and function on Mac).  Also
need to address libz.dylib vs libz.a.  Currently resolving against
dylib which is not what I want.