Remove non-required overrides for updated versions

* Updated zip no longer requires HASH fix
* Updated ncurses has been configured to use gnu-config
  information

Signed-off-by: Nathan Rossi <nathan.rossi@xilinx.com>
misc/poky-patches: Remove, all patches are now upstream

Signed-off-by: Nathan Rossi <nathan.rossi@xilinx.com>