bindings/rust/libflashrom: Create fat rust binding

Create a rust library wrapping libflashrom-sys in a more idiomatic rust
API.

BUG=b:230545739
BRANCH=None
TEST=cargo test

Change-Id: Ie3bcfde40dc475f6a9439ccab8e2446967f7d6dd
Signed-off-by: Evan Benn <evanbenn@chromium.org>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/65281
Reviewed-by: Peter Marheine <pmarheine@chromium.org>
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

bindings/rust/libflashrom/build.rs

@@ -0,0 +1,17 @@
+extern crate cc;
+
+fn main() {
+    // pkg_config is needed only to pick up the include path for log.c to use.
+    // libflashrom-sys tells cargo how to link to libflashrom.
+    let flashrom = pkg_config::Config::new()
+        .cargo_metadata(false)
+        .probe("flashrom")
+        .unwrap();
+    let mut log_c = cc::Build::new();
+    log_c.file("src/log.c");
+    for p in flashrom.include_paths {
+        log_c.include(p);
+    }
+    log_c.compile("log.o");
+    println!("cargo:rerun-if-changed=src/log.c");
+}