app, configure: add a --enable-win32-debug-console build option.
Debugging stable versions under Windows is a pain because we don't have access to the standard outputs. The debug console is indeed only built on unstable builds. Let's make the debug console a separate build option to allow building stable versions for debug (obviously the default behavior when not configuring, is same as before, i.e. stable without console and unstable with console). (cherry picked from commit 1a288789)
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