xtensor cmake variables do not match variables in CMakeLists.txt

[mircomarahrens]

Including this project via add_subdirectory(path/to/xtensor/python) leads to

[cmake] ERRORMismatch xtensor versions. Found '..' but requires: '0.24.0'

at the cmake configuration step.

The variables ${XTENSOR_VERSION_MAJOR}, ${XTENSOR_VERSION_MINOR}, ${XTENSOR_VERSION_PATCH} seems to be wrong in

xtensor-python/CMakeLists.txt

Line 37 in a0f1bb6

set(xtensor_VERSION ${XTENSOR_VERSION_MAJOR}.${XTENSOR_VERSION_MINOR}.${XTENSOR_VERSION_PATCH})

. I don't know why yet, but XTENSOR in the variables is in lower case here,

[cmake] -- xtensor_VERSION_MAJOR=0
[cmake] -- xtensor_VERSION_MINOR=24
[cmake] -- xtensor_VERSION_PATCH=6