* Fix#11081 GUI: Windows release build crashes
Use generator expressions rather than if statements when adding compiler
options or definitions.
* Fix#11081 GUI: Windows CMake debug build fails with default options
When DISABLE_CRTDBG_MAP_ALLOC is using the default value (OFF), the
debug build of cppcheck-gui fails, as the "realloc" method names in some
of the Qt headers are replaced by the macro defined by the compiler.
Thus DISABLE_CRTDBG_MAP_ALLOC is explicitely set when compiling
cppcheck-gui in Debug mode using MSVC.
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