Add endian option for configure.

For the payload project, the endian check does not work(due to some
problem with the hardfloating point settings for stm32f7). So now
we can pass in the endianness as an option when needed.

Slight fix to uart windows driver.

Looks like this is fixed in later versions of csp.
We should probably upgrade....

Change return type of get queue function.

hotfix 1.0.1

LibCSP 1.0