PPC EABI: Update cmath header with atan

Author: JoshSanch

src/PowerPC_EABI_Support/include/PowerPC_EABI_Support/MSL_C/MSL_Common/cmath

@@ -9,6 +9,7 @@ namespace std
 
 #ifndef INLINE
     float atan2f(float y, float x);
+    float atan(float x);
     float sinf(float x);
     float cosf(float x);
     float tanf(float x);
@@ -25,6 +26,11 @@ namespace std
         return (float)atan2((double)y, (double)x);
     }
 
+    inline float atan(float x)
+    {
+        return (float)atan((double)x);
+    }
+
     inline float sinf(float x)
     {
         return (float)sin((double)x);