Updated the MSVC builing files, adding Visual Studio 2015 as well.

src/win/win_joystick.cpp

@@ -11,7 +11,7 @@
  * NOTE:	Hacks currently needed to compile with MSVC; DX needs to
  *		be updated to 11 or 12 or so.  --FvK
  *
- * Version:	@(#)win_joystick.cpp	1.0.6	2018/03/25
+ * Version:	@(#)win_joystick.cpp	1.0.7	2018/03/26
  *
  * Authors:	Fred N. van Kempen, <decwiz@yahoo.com>
  *		Miran Grca, <mgrca8@gmail.com>
@@ -50,9 +50,6 @@
 #endif
 #include <stdio.h>
 #include <stdint.h>
-#ifdef _WIN32
-# define _USE_MATH_DEFINES
-#endif
 #include <math.h>
 #include "../emu.h"
 #include "../device.h"