Fix builds from menu on Windows
When compiling for Windows via MinGW using CMake the variable RADIANT_EXECUTABLE is incorrectly set to ".exe" (it should be just "exe") and that prevents the user to build from Radiant menu.
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When compiling for Windows via MinGW using CMake the variable RADIANT_EXECUTABLE is incorrectly set to ".exe" (it should be just "exe") and that prevents the user to build from Radiant menu.