DebugNative fxpackager Windows build produces macro redefinition warnings

After the fix for RT-39039, the build produces a lot of warnings:
Exports.cpp
...\rt\modules\fxpackager\src\main\native\library\common\Platform.h(86) : warning C4005: 'DEBUG' : macro redefinition
        command-line arguments : see previous definition of 'DEBUG'

Glass uses the following stategy:
#if defined(_DEBUG) || defined(DEBUG)
...
Prism-D3d uses this:
#if defined _DEBUG && !defined DEBUG
    #define DEBUG
#endif