gdb: don't build on avr32

SVN-Revision: 17865

package/gdb/Makefile

@@ -19,6 +19,7 @@ include $(INCLUDE_DIR)/package.mk
 define Package/gdb/Default
   SECTION:=utils
   CATEGORY:=Utilities
+  DEPENDS:= @!avr32
 endef
 
 define Package/gdb