btrfs-progs: disable for avr32

Toolchain issues prevent it from being built, also there's no AVR32 with
proper storage ports for such a filesystem. Fixes:
http://autobuild.buildroot.net/results/06501fd32c30549810c12f0ad50f510c4b74ee63/

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/btrfs-progs/Config.in

@@ -4,6 +4,7 @@ config BR2_PACKAGE_BTRFS_PROGS
 	depends on BR2_USE_WCHAR # util-linux
 	depends on BR2_USE_MMU # util-linux
 	depends on BR2_TOOLCHAIN_HAS_THREADS
+	depends on !BR2_avr32 # toolchain issues
 	select BR2_PACKAGE_ACL
 	select BR2_PACKAGE_ATTR
 	select BR2_PACKAGE_E2FSPROGS
@@ -19,5 +20,6 @@ config BR2_PACKAGE_BTRFS_PROGS
 
 comment "btrfs-progs needs a toolchain w/ largefile, wchar, threads"
 	depends on BR2_USE_MMU
+	depends on !BR2_avr32
 	depends on !BR2_LARGEFILE || !BR2_USE_WCHAR || \
 		!BR2_TOOLCHAIN_HAS_THREADS