This function calls the cmake executable whose path is
given in input and check if its version is higher than
3.10 which is the minimum required for rkeops to work.
check_cmake(cmake_executable, onLoad = FALSE)a value 1 or 0 depending if checks are ok or not.
text string, path to cmake
(e.g. /path/to/cmake on Unix system).
Ghislain Durif
The function check for the existence of the input file
cmake_executable, if it is actually a cmake executable
and its version (rkeops requires cmake >= 3.10).