mtr: not available for avr32

The uclibc version condition is accurate but doesn't cover external
toolchains, so also exclude for avr32 too which only has 0.9.31 enabled.
Fixes:
http://autobuild.buildroot.net/results/4ee/4eec6e29d0f2a46bbbe3a748e85bd06c3601b7c1/

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

package/mtr/Config.in

@@ -2,6 +2,7 @@ config BR2_PACKAGE_MTR
 	bool "mtr"
 	# res_mkquery() only available in 0.9.33+
 	depends on !BR2_UCLIBC_VERSION_0_9_31 && !BR2_UCLIBC_VERSION_0_9_32
+	depends on !BR2_avr32
 	help
 	  mtr combines the functionality of the 'traceroute' and 'ping'
 	  programs in a single network diagnostic tool.