Unbound is now a submodule. Adapt depends for this.

Fix builds for native linux and windows

The architecture flag was set incorrectly.
It needs to be set only when compiling arm6.

contrib/depends/toolchain.cmake.in

@@ -65,8 +65,6 @@ else()
   SET(CMAKE_CXX_COMPILER @CXX@)
 endif()
 
-set(ARCH @arch@)
-
 if(ARCH STREQUAL "arm")
   set(ARCH "armv6zk")
   set(ARMID "armv6zk")