Fix type_traits vs min() compatibility issue

teensy3/WProgram.h

 void randomSeed(uint32_t newseed);
 void srandom(uint32_t newseed);
 
-#include <type_traits>
-// when the input number is an integer type, do all math as 32 bit signed long
-template <class T, class A, class B, class C, class D>
-T map(T _x, A _in_min, B _in_max, C _out_min, D _out_max, typename std::enable_if<std::is_integral<T>::value >::type* = 0)
-{
-	long x = _x, in_min = _in_min, in_max = _in_max, out_min = _out_min, out_max = _out_max;
-	// Arduino's traditional algorithm
-	//return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
-	// st42's suggestion: https://github.com/arduino/Arduino/issues/2466#issuecomment-69873889
-	if ((in_max - in_min) > (out_max - out_min)) {
-		return (x - in_min) * (out_max - out_min+1) / (in_max - in_min+1) + out_min;
-	} else {
-		return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
-	}
-}
-// when the input is a float or double, do all math using the input's type
-template <class T, class A, class B, class C, class D>
-T map(T x, A in_min, B in_max, C out_min, D out_max, typename std::enable_if<std::is_floating_point<T>::value >::type* = 0)
-{
-	return (x - (T)in_min) * ((T)out_max - (T)out_min) / ((T)in_max - (T)in_min) + (T)out_min;
-}
-
 #include "pins_arduino.h"
 
 #endif // __cplusplus

teensy3/wiring.h

 #include "core_id.h"
 #include "core_pins.h"
 
+// type_traits interferes with min() and other defines
+// include it early, so we can define these later
+// for Arduino compatibility
+#ifdef __cplusplus
+#include <type_traits>
+// when the input number is an integer type, do all math as 32 bit signed long
+template <class T, class A, class B, class C, class D>
+T map(T _x, A _in_min, B _in_max, C _out_min, D _out_max, typename std::enable_if<std::is_integral<T>::value >::type* = 0)
+{
+	long x = _x, in_min = _in_min, in_max = _in_max, out_min = _out_min, out_max = _out_max;
+	// Arduino's traditional algorithm
+	//return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
+	// st42's suggestion: https://github.com/arduino/Arduino/issues/2466#issuecomment-69873889
+	if ((in_max - in_min) > (out_max - out_min)) {
+		return (x - in_min) * (out_max - out_min+1) / (in_max - in_min+1) + out_min;
+	} else {
+		return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
+	}
+}
+// when the input is a float or double, do all math using the input's type
+template <class T, class A, class B, class C, class D>
+T map(T x, A in_min, B in_max, C out_min, D out_max, typename std::enable_if<std::is_floating_point<T>::value >::type* = 0)
+{
+	return (x - (T)in_min) * ((T)out_max - (T)out_min) / ((T)in_max - (T)in_min) + (T)out_min;
+}
+#endif
+
 #ifdef __cplusplus
 extern "C"{
 #endif