Without this change the perl path from the build system is used.
(From OE-Core rev: feff6030091d519a0738e2a5db47654dcd13ef13)
(From OE-Core rev: 077a85c4fa376b5e7ee826589bbd4fe6776a326f)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>