quilt: Fix paths for patch and perl

quilt: Fix paths for patch and perl

Currently some shebang lines end up as
    #! /usr/bin/env perl -w
env does not like the argument. Also the current sed to insert env
does not cover the copies ptests use. Fix these issues by:
 - using --with-perl to insert "env"
 - Replacing "-w" in shebang lines with a new "use warning;" line

Remove a EXTRA_OECONF_append_class_target from the native recipe.
Don't overwrite EXTRA_OECONF in native: the values should be correct
for native as well.

--with-patch is used within the gnu patch wrapper only: before this
commit the wrapper contained a (build host) path to native patch.

Also tweak one test so busybox mv output is accepted.

All ptests should now pass: Fixes [YOCTO #11221].

Signed-off-by: Jussi Kukkonen <jussi.kukkonen@intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>