Fixed compiler warnings.

src/utils/vec3.cpp

@@ -41,8 +41,8 @@ void Vec3::setHPR(const btQuaternion& q)
  */
 void Vec3::setPitchRoll(const Vec3 &normal)
 {
-    const float X = sin(getHeading());
-    const float Z = cos(getHeading());
+    const float X = sinf(getHeading());
+    const float Z = cosf(getHeading());
     // Compute the angle between the normal of the plane and the line to
     // (x,0,z).  (x,0,z) is normalised, so are the coordinates of the plane,
     // which simplifies the computation of the scalar product.

src/utils/vec3.hpp

@@ -185,8 +185,8 @@ public:
      *  used as a 2d vector. */
     // ------------------------------------------------------------------------
     /** Returns the length of the vector using only the x/z coordinates. */
-    float length_2d() const {return sqrt(  m_floats[0]*m_floats[0]
-                                         + m_floats[2]*m_floats[2]);}
+    float length_2d() const {return sqrtf(  m_floats[0]*m_floats[0]
+                                          + m_floats[2]*m_floats[2]);}
     // ------------------------------------------------------------------------
     /** Sets this = max(this, a) componentwise.
      *  \param Vector to compare with. */