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.
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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.