pip_install_wheel expects the wheels to be in PIP_INSTALL_DIST_PATH but
this class was writing to the same directory through chance not design.
Respect PIP_INSTALL_DIST_PATH as the output directory.
(From OE-Core rev: 12857a77ad424c3c3cbc37275374a603e528d9f1)
Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>