[bug #39297] <avr/interrupt.h> documentation should mention SIG* is now poisoned

[avrs-admin]

Thu 20 Jun 2013 11:35:27 AM CEST

Now that the AVR-LibC headers for devices that still have SIG_* names defined also uses #poison for each the manual should be updated to reflect this and point out that it's no longer the case that SIG_* is simply deprecated but is effectively unusable unless AVR_LIBC_DEPRECATED_ENABLE is defined.

This issue was migrated from https://savannah.nongnu.org/bugs/?39297