math defines on windows

Author: hannorein

src/rebound.h

@@ -32,6 +32,7 @@
 #define _LP64   // automatically defined on 64bit Linux and MacOS
 #endif // _WIN64
 #ifdef _WIN32
+#define _USE_MATH_DEFINES // Windows (MVSC) does not include math constants by default.
 #define REB_RESTRICT
 // Windows needs different declarations depending on whether the library is built or used.
 #ifdef BUILDINGLIBREBOUND

src/rebound_internal.h

@@ -28,7 +28,6 @@
 
 // Definitions for functions that we need to implement ourselves on Windows.
 #ifdef _WIN32
-#define _USE_MATH_DEFINES // Windows (MVSC) does not include math constants by default.
 #define _NO_CRT_STDIO_INLINE // WIN32 to use _vsprintf_s
 #include <WinSock2.h>
 #define _WINSOCKAPI_ //stops windows.h including winsock.h