kbuild: mkmakefile: generate a simple wrapper of top Makefile

Now that Kbuild is able to start from any directory, the generated
Makefile can simply wrap the top Makefile.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Kieran Bingham <kbingham@kernel.org>
1 file changed