Sanguino Interrupt define incomplete

[mamama1]

Hi

I would suggest to add 1284(P) support by adding " || defined(AVR_ATmega1284P) || defined(AVR_ATmega1284)" to line 59 in interrupt_pins.h.

Currently working on a project in PlatformIO with an Encoder and a 1284P and meanwhile I'm doing this via build options:

-D CORE_NUM_INTERRUPT=3
-D CORE_INT0_PIN=10
-D CORE_INT1_PIN=11
-D CORE_INT2_PIN=2

I'd do a pull request but unfortunately I'm too stupid for that. Thanks!

[ssilverman]

Note that the commit message isn't exactly the same as the PR description. See if it's acceptable to you.