community/binutils-cross-embedded: Add AVR

Also add Stefan Wagner as co-maintainer, who previously maintained the separate
binutils-avr package.

community/binutils-cross-embedded/APKBUILD

+# Contributor: Stefan Wagner <stw@bit-strickerei.de>
 # Maintainer: Marian Buschsieweke <marian.buschsieweke@ovgu.de>
 # Based on binutils-avr
 _pkgbase=binutils
 _targets="
 	arm-none-eabi
+	avr
 	mips-mti-elf
 	msp430-elf
 	or1k-elf
@@ -10,7 +12,7 @@ _targets="
 	"
 pkgname="$_pkgbase-cross-embedded"
 pkgver=2.35.1
-pkgrel=0
+pkgrel=1
 pkgdesc="Tools necessary to build programs for embedded targets"
 url="https://www.gnu.org/software/binutils/"
 makedepends="gettext libtool autoconf automake bison texinfo zlib-dev"