FindMatlab: Don't use the deprecated variable CMAKE_CL_64
This causes a 32-bit Matlab version to be found when doing a 64-bit MinGW build. This commit replaces the 64-bit build check with a check using CMAKE_SIZEOF_VOID_P.
This causes a 32-bit Matlab version to be found when doing a 64-bit MinGW build. This commit replaces the 64-bit build check with a check using CMAKE_SIZEOF_VOID_P.