Define macro to determine endian type
Check if the system is big endian or little endian
TEST_BIG_ENDIAN(VARIABLE) VARIABLE - variable to store the result to
© 2000–2016 Kitware, Inc.
© 2000–2011 Insight Software Consortium
Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.7/module/TestBigEndian.html