add IS_PIN_SPI for Teensy and Wireing boards

Author: ntruchsess

Boards.h

@@ -159,6 +159,7 @@ writePort(port, value, bitmask):  Write an 8 bit port.
 #define IS_PIN_PWM(p)           digitalPinHasPWM(p)
 #define IS_PIN_SERVO(p)         ((p) >= 0 && (p) < MAX_SERVOS)
 #define IS_PIN_I2C(p)           ((p) == SDA || (p) == SCL)
+#define IS_PIN_SPI(p)           ((p) == SS || (p) == MOSI || (p) == MISO || (p) == SCK)
 #define PIN_TO_DIGITAL(p)       (p)
 #define PIN_TO_ANALOG(p)        ((p) - FIRST_ANALOG_PIN)
 #define PIN_TO_PWM(p)           PIN_TO_DIGITAL(p)
@@ -209,6 +210,7 @@ writePort(port, value, bitmask):  Write an 8 bit port.
 #define IS_PIN_PWM(p)           digitalPinHasPWM(p)
 #define IS_PIN_SERVO(p)         ((p) >= 0 && (p) < MAX_SERVOS)
 #define IS_PIN_I2C(p)           (0)
+#define IS_PIN_SPI(p)           ((p) == SS || (p) == MOSI || (p) == MISO || (p) == SCK)
 #define PIN_TO_DIGITAL(p)       (p)
 #define PIN_TO_ANALOG(p)        (0)
 #define PIN_TO_PWM(p)           PIN_TO_DIGITAL(p)
@@ -225,6 +227,7 @@ writePort(port, value, bitmask):  Write an 8 bit port.
 #define IS_PIN_PWM(p)           digitalPinHasPWM(p)
 #define IS_PIN_SERVO(p)         ((p) >= 0 && (p) < MAX_SERVOS)
 #define IS_PIN_I2C(p)           ((p) == 5 || (p) == 6)
+#define IS_PIN_SPI(p)           ((p) == SS || (p) == MOSI || (p) == MISO || (p) == SCK)
 #define PIN_TO_DIGITAL(p)       (p)
 #define PIN_TO_ANALOG(p)        (((p)<22)?21-(p):11)
 #define PIN_TO_PWM(p)           PIN_TO_DIGITAL(p)
@@ -241,6 +244,7 @@ writePort(port, value, bitmask):  Write an 8 bit port.
 #define IS_PIN_PWM(p)           digitalPinHasPWM(p)
 #define IS_PIN_SERVO(p)         ((p) >= 0 && (p) < MAX_SERVOS)
 #define IS_PIN_I2C(p)           ((p) == 0 || (p) == 1)
+#define IS_PIN_SPI(p)           ((p) == SS || (p) == MOSI || (p) == MISO || (p) == SCK)
 #define PIN_TO_DIGITAL(p)       (p)
 #define PIN_TO_ANALOG(p)        ((p) - 38)
 #define PIN_TO_PWM(p)           PIN_TO_DIGITAL(p)