At best it gave 1-2% improvement now, its 32 bit x86 only and isn't
supported after python 2.6.
PyPy is probably a better option now.
(Bitbake rev: 3c3bd0c2fa80d747f25401c17b785c7c2f3787ca)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>