Subject: nettle: 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/b608e6beaa1d38c14fc16ad53780d94954a91900
https://sources.debian.org/src/rust-nettle/7.0.0-1/debian/patches/disable-vendor.diff/
--- a/Cargo.toml	1969-12-31 19:00:00.000000000 -0500
+++ b/Cargo.toml	2019-10-23 19:12:01.076181971 -0400
@@ -35,4 +35,4 @@
 version = "1"
 
 [features]
-vendored = ["nettle-sys/vendored"]
+vendored = []