rust: add bindgen step as a meson dependency

Add bindings_rs target for generating rust bindings to target-independent
qemu C APIs.

The bindings need be created before any rust crate that uses them is
compiled.

The bindings.rs file will end up in BUILDDIR/bindings.rs and have the
same name as a target:

  ninja bindings.rs

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Link: https://lore.kernel.org/r/1be89a27719049b7203eaf2eca8bbb75b33f18d4.1727961605.git.manos.pitsidianakis@linaro.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index fb3188c..f090295 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4191,7 +4191,11 @@
 Rust build system integration
 M: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
 S: Maintained
+F: scripts/rust/
+F: rust/.gitignore
 F: rust/Kconfig
+F: rust/meson.build
+F: rust/wrapper.h
 
 Miscellaneous
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