Please make sure to update this file as well for new versions of GDB.

toolchain/gdb/Config.in.2

@@ -52,4 +52,5 @@ config BR2_EXT_GDB_VERSION
 	default "6.3"      if BR2_EXT_GDB_VERSION_6_3
 	default "6.4"      if BR2_EXT_GDB_VERSION_6_4
 	default "6.5"      if BR2_EXT_GDB_VERSION_6_5
+	default "6.6"      if BR2_EXT_GDB_VERSION_6_6
 	default "snapshot" if BR2_EXT_GDB_VERSION_SNAPSHOT