fix: build-error on atmega128

Since MCUSR and some other Macros (from boot.h) are marked as
depreciated, gcc will fail to compile.
Solve by deactivating poison-pragma: __AVR_LIBC_DEPRECATED_ENABLE__

Signed-off-by: Stephan Baerwolf <stephan.baerwolf@tu-ilmenau.de>
fix: DANGEROUS addressing issue in spminterface.h

Systematic testing issued an error in the definition of
funcaddr___bootloader__do_spm for ATmega644.
Thank to automatic addressverification this error could
be discovered.

Signed-off-by: Stephan Baerwolf <stephan.baerwolf@tu-ilmenau.de>