Oops, add actual gcc diff also.

Use arm-none-eabi-gcc instead of arm-gcc.

Make the scripts more generic.

Also, patch gcc sources so that gnattools are included.

Ignore rts-sources/samd21-obj also.

Ignore generated/fetched directories/files.

Add binutils and update gcc version.

Fix gnat.adc and RTS object directory locations.

Beginnings of SAMD-Ada (GNAT for SAMD2x MCU).