Revert "Going to just use MSB_FIRST or LSB_FIRST here as an ifdef - this"

This reverts commit 167ec024254e806a1a7298ff8a4f78051d2f9200.
Revert "Define MSB_FIRST for Xbox 360"

This reverts commit 97d0e566502dacdfae7fe1c2f1bddc6973cdfebb.