Removed _USE_MATH_DEFINES directive (#596)

Since none of the `M_` prefixed constants are used anywhere in the code, this is unnecessary.  It's also Windows-specific, so these non-standard defines shouldn't be used anyway.

Ref: https://learn.microsoft.com/en-us/cpp/c-runtime-library/math-constants?view=msvc-170

DebugUtils/Source/DebugDraw.cpp

@@ -16,7 +16,6 @@
 // 3. This notice may not be removed or altered from any source distribution.
 //
 
-#define _USE_MATH_DEFINES
 #include <string.h>
 #include "DebugDraw.h"
 #include "DetourMath.h"