No entrypoint `main` in VST2

[jpcima]

The 32-bit builds of VST2 with mingw will not generate the legacy main entrypoint.
The conditional JUCE_MSVC disallows this code to build on mingw, it should be probably replaced with JUCE_WINDOWS.
(also a warning suppression for -Wmain)

JUCE/modules/juce_audio_plugin_client/VST/juce_VST_Wrapper.cpp

Line 2223 in 1e28e8c

#if ! defined (JUCE_64BIT) && JUCE_MSVC // (can't compile this on win64, but it's not needed anyway with VST2.4)

[falkTX]

shouldn't this go to upstream juce? what do they say about it?