Delete PYTHONOPTIMIZE patch as it's useless.

See https://github.com/popcornmix/xbmc/commit/2d119dfa6187af50eb1653f9d782ef42edcb876a
My further tests demonstrated it provides negligible or any performance gain at all on a Raspberry Pi. Its impact should be even more unnoticeable on a CuBox-i/HummingBoard.