* include/Makefile.am (avr_HEADERS): Add signal.h .
        * include/signal.h: New file.


git-svn-id: http://svn.savannah.nongnu.org/svn/avr-libc/trunk@2430 1084037a-409f-4a99-8160-1a4b3577d4c1
Update xmega wdt_enable to wait until SYNCBUSY bit is cleared. Add wdt_disable for xmega.

git-svn-id: http://svn.savannah.nongnu.org/svn/avr-libc/trunk@2431 1084037a-409f-4a99-8160-1a4b3577d4c1