meson: use subproject for internal libfdt

Recent dtc/libfdt can use either Make or meson as the build system.
By using a subproject, our own meson.build can remove the hard
coded list of source files.

This is also the first step towards managing downloads with .wrap
files instead of submodule.

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 0 insertions, 0 deletions

diff --git a/subprojects/dtc b/subprojects/dtc
new file mode 160000
+Subproject b6910bec11614980a21e46fbccc35934b671bd8