qapi: Add includes from qapi/ as dependencies qapi-schema.json has been split into three smaller JSON files in qapi/. Add them as dependencies for the code generation in the Makefile, so changes to them will result in a rebuilt of all QAPI-dependent code. Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>