Fix compilation for UNOR4

Author: pgrawehr

Boards.h

@@ -470,7 +470,7 @@ writePort(port, value, bitmask):  Write an 8 bit port.
 #define VERSION_BLINK_PIN       13
 #define IS_PIN_DIGITAL(p)       ((p) >= 2 && (p) <= 19)
 #define IS_PIN_ANALOG(p)        ((p) >= 14 && (p) < 14 + TOTAL_ANALOG_PINS)
-#define IS_PIN_PWM(p)           digitalPinHasPWM(p)
+#define IS_PIN_PWM(p)           IS_PIN_DIGITAL(p)
 #define IS_PIN_SERVO(p)         (IS_PIN_DIGITAL(p) && (p) - 2 < MAX_SERVOS)
 #define IS_PIN_I2C(p)           ((p) == 18 || (p) == 19)
 #define IS_PIN_SPI(p)           ((p) == SS || (p) == MOSI || (p) == MISO || (p) == SCK)