build.rs: Suppress new cargo features warning

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/build.rs b/build.rs
index 299a2862384f89ec47b9d0156680fc58abe5537b..78dee7a500fa36676173f5e01badf4ed19c3f31a 100644 (file)
--- a/build.rs
+++ b/build.rs
@@ -53,6 +53,7 @@ impl Context<'_> {
       let cfg = test.replace('.', "_").replace(">=", "ge_");
       let test: semver::VersionReq = test.parse().unwrap();
       let cfg = format!("{package}_{cfg}");
+      println!(r#"cargo:rustc-check-cfg=cfg({cfg})"#);
       if test.matches(&pkg) {
         println!("cargo:rustc-cfg={cfg}");
       }