Disabled annoying MSVC 2015 warnings in ADL and OPN files

src\sound\adlmidi\adlmidi_private.hpp(457): warning C4800: 'int': forcing value to bool 'true' or 'false' (performance warning) (compiling source file src\sound\adlmidi\adlmidi.cpp)
src\sound\opnmidi\opnmidi_private.hpp(404): warning C4800: 'int': forcing value to bool 'true' or 'false' (performance warning) (compiling source file src\sound\opnmidi\opnmidi.cpp)
src\sound\adlmidi\adlmidi_private.hpp(457): warning C4800: 'int': forcing value to bool 'true' or 'false' (performance warning) (compiling source file src\sound\adlmidi\adlmidi_midiplay.cpp)
src\sound\adlmidi\adlmidi_private.hpp(457): warning C4800: 'int': forcing value to bool 'true' or 'false' (performance warning) (compiling source file src\sound\adlmidi\adlmidi_load.cpp)
src\sound\adlmidi\adlmidi_private.hpp(457): warning C4800: 'int': forcing value to bool 'true' or 'false' (performance warning) (compiling source file src\sound\adlmidi\adlmidi_private.cpp)
src\sound\adlmidi\adlmidi_private.hpp(457): warning C4800: 'int': forcing value to bool 'true' or 'false' (performance warning) (compiling source file src\sound\adlmidi\adlmidi_opl3.cpp)
src\sound\opnmidi\opnmidi.cpp(132): warning C4800: 'int': forcing value to bool 'true' or 'false' (performance warning)
src\sound\opnmidi\opnmidi.cpp(147): warning C4800: 'unsigned int': forcing value to bool 'true' or 'false' (performance warning)
src\sound\adlmidi\adlmidi.cpp(168): warning C4800: 'int': forcing value to bool 'true' or 'false' (performance warning)
src\sound\adlmidi\adlmidi.cpp(177): warning C4800: 'int': forcing value to bool 'true' or 'false' (performance warning)
src\sound\adlmidi\adlmidi.cpp(186): warning C4800: 'int': forcing value to bool 'true' or 'false' (performance warning)
src\sound\adlmidi\adlmidi.cpp(195): warning C4800: 'int': forcing value to bool 'true' or 'false' (performance warning)
src\sound\adlmidi\adlmidi.cpp(209): warning C4800: 'int': forcing value to bool 'true' or 'false' (performance warning)
src\sound\adlmidi\adlmidi_midiplay.cpp(740): warning C4800: 'int': forcing value to bool 'true' or 'false' (performance warning)
src\sound\adlmidi\adlmidi_midiplay.cpp(741): warning C4800: 'int': forcing value to bool 'true' or 'false' (performance warning)
src\sound\adlmidi\adlmidi_midiplay.cpp(742): warning C4800: 'int': forcing value to bool 'true' or 'false' (performance warning)
src\sound\adlmidi\adlmidi_midiplay.cpp(743): warning C4800: 'int': forcing value to bool 'true' or 'false' (performance warning)
src\sound\opnmidi\opnmidi_private.hpp(404): warning C4800: 'int': forcing value to bool 'true' or 'false' (performance warning) (compiling source file src\sound\opnmidi\opnmidi_midiplay.cpp)
src\sound\opnmidi\opnmidi_private.hpp(404): warning C4800: 'int': forcing value to bool 'true' or 'false' (performance warning) (compiling source file src\sound\opnmidi\opnmidi_load.cpp)
src\sound\opnmidi\opnmidi_midiplay.cpp(697): warning C4800: 'int': forcing value to bool 'true' or 'false' (performance warning)
src\sound\opnmidi\opnmidi_midiplay.cpp(698): warning C4800: 'unsigned int': forcing value to bool 'true' or 'false' (performance warning)
src\sound\opnmidi\opnmidi_private.hpp(404): warning C4800: 'int': forcing value to bool 'true' or 'false' (performance warning) (compiling source file src\sound\opnmidi\opnmidi_opn2.cpp)
src\sound\opnmidi\opnmidi_private.hpp(404): warning C4800: 'int': forcing value to bool 'true' or 'false' (performance warning) (compiling source file src\sound\opnmidi\opnmidi_private.cpp)

src/sound/adlmidi/adlmidi_private.hpp

@@ -109,6 +109,7 @@ typedef int32_t ssize_t;
 #pragma warning(disable:4267)
 #pragma warning(disable:4244)
 #pragma warning(disable:4146)
+#pragma warning(disable:4800)
 #endif
 
 #include "fraction.hpp"

src/sound/opnmidi/opnmidi_private.hpp

@@ -81,6 +81,7 @@ typedef __int32 ssize_t;
 #pragma warning(disable:4244)
 #pragma warning(disable:4267)
 #pragma warning(disable:4146)
+#pragma warning(disable:4800)
 #endif