CMake support for the Linux x86-64 32-bit ABI (x32-abi)

This issue was created automatically from an original Mantis Issue. Further discussion may take place here.

Currently CMake assumes library files can be located in ${CMAKE_INSTALL_PREFIX}/lib{64}, or otherwise on the system in /lib{64}, /usr/lib{64} etc. This isn't the case with x32-abi, where library directories are postfixed with x32, for example: ${CMAKE_INSTALL_PREFIX}/libx32

This results in CMake modules being unable to locate their resources, including failure during the configuration of CMake itself after initial bootstrap if CMAKE_INSTALL_PREFIX and individual *_DIR=/usr/libx32/cmake/* variables aren't manually provided.

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