OpenGL: Allow setting window bounds from repaint callback

On Windows, the OpenGL context window sometimes receives a repaint
request after moving between screens with different scale factors.
If the screen has changed size/scale since the last paint operation,
failing to invalidate the painted area may cause the screen contents
to be drawn at the wrong scale until paint is next called.

modules/juce_audio_plugin_client/VST/juce_VST_Wrapper.cpp

@@ -68,6 +68,7 @@ JUCE_BEGIN_IGNORE_WARNINGS_MSVC (4996 4100)
 JUCE_BEGIN_IGNORE_WARNINGS_GCC_LIKE ("-Wconversion",
                                      "-Wshadow",
                                      "-Wdeprecated-register",
+                                     "-Wdeprecated-declarations",
                                      "-Wunused-parameter",
                                      "-Wdeprecated-writable-strings",
                                      "-Wnon-virtual-dtor",