[arch-general] Updates for avr-gcc and avr-libc

Hi, the current maintainer of avr-gcc and avr-libc, Jakob Gruber, seems to be away until October [1]. In the meantime new versions of both packages have been released. Due to a bug within avr-gcc 4.9.0, avr-libc 1.8.1 cannot be built [2] and avr-gcc 4.9.1 is required, so actually both packages should be upgraded at once. Simply bumping the numbers within the appropriate PKGBUILD seems to be sufficient, some developer and/or TU could take care of this? Best regards, Karol Babioch [1]: https://mailman.archlinux.org/pipermail/arch-dev-public/2014-July/026451.htm... [2]: https://lists.nongnu.org/archive/html/avr-libc-dev/2014-08/msg00020.html