Quick way to get mingw to build

Signed-off-by: falkTX <falktx@falktx.com>

source/modules/juce_core/threads/juce_WaitableEvent.h

@@ -20,6 +20,10 @@
   ==============================================================================
 */
 
+#if JUCE_MINGW
+#include "../../hylia/mingw-std-threads/mingw.condition_variable.h"
+#endif
+
 namespace juce
 {