[cmake-developers] 15975 Bug Fix GHS MULTI try compile

[Geoffrey Viola]

Attached are updates for the bug recorded at https://cmake.org/Bug/view.php?id=15975. The updates make the Green Hills MULTI executable suffix, .as, set in the CMAKE_EXECUTABLE_SUFFIX macro, instead of in the C++ code where it wasn't accessible to the other parts of CMake.

As a side note, both Green Hills and Linux do not have suffixes on their executables by default. The .as suffix is somewhat arbitrary. A CMAKE_EXECUTABLE_SUFFIX value of "" will not work because Green Hills MULTI does not allow for filenames and folders in the same directory. At try_compile's the compilation stage, there will be a folder named after the project name for the project at the root. Since the RUNTIME_OUTPUT_DIRECTORY is set to the root, the compilation will stop and explain that the output file is a directory.

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