xrPhysics: fix phInfinity to be infinity

Author: Xottab-DUTY

src/xrGame/ik/limb.cxx

@@ -738,8 +738,7 @@ int Limb::try_singularities(int solves, float& swivel_angle, float x[])
 //
 // Assumes that either SetGoal or SetGoalPos has been called first
 //
-// XXX: Shouldn't the phInfinity declaration be in a header for xrPhysics?
-extern XRPHYSICS_API const float phInfinity;
+
 int Limb::Solve(float x[], float* new_swivel, float* new_pos)
 {
     int success;

src/xrPhysics/MathUtils.cpp

@@ -3,7 +3,6 @@
 #include "xrCore/_cylinder.h"
 #include <ode/common.h>
 
-XRPHYSICS_API const float phInfinity = dInfinity;
 /*
 #include "MathUtils.h"
 enum EBoxSideNearestPointCode

src/xrPhysics/MathUtils.h

@@ -8,7 +8,7 @@
 #ifdef DEBUG
 #include "xrCore/dump_string.h"
 #endif
-extern XRPHYSICS_API const float phInfinity;
+constexpr float phInfinity = std::numeric_limits<float>::infinity();
 
 template <class T> struct _quaternion;
 typedef _quaternion<float> Fquaternion;