Subject: nettle-sys: clear out "vendored" feature cruft from build.rs
From: Daniel Kahn Gillmor's avatarDaniel Kahn Gillmor <dkg@fifthhorseman.net>

https://salsa.debian.org/rust-team/debcargo-conf/-/commit/0c71150ad26bb66a8396dcdab055181af232ddc5
https://sources.debian.org/src/rust-nettle-sys/2.0.4-3/debian/patches/disable-vendor.diff/
--- a/Cargo.toml	2019-10-23 13:08:07.000000000 -0400
+++ b/Cargo.toml	2019-10-23 14:08:46.644064014 -0400
@@ -29,12 +29,9 @@
 version = "0.51.1"
 default-features = false
 
-[build-dependencies.nettle-src]
-version = "3.5.1-0"
-optional = true
-
 [build-dependencies.pkg-config]
 version = "0.3"
 
 [features]
 vendored = ["nettle-src"]
+nettle-src = []
diff --git a/build.rs b/build.rs
index 44f7af3..ede4b2f 100644
--- a/build.rs
+++ b/build.rs
@@ -1,7 +1,5 @@
 extern crate bindgen;
 extern crate pkg_config;
-#[cfg(feature = "vendored")]
-extern crate nettle_src;
 
 use std:</td></tr></table>
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