Auto merge of #12444 - ehuss:remove-build-metadata, r=weihanglo

Remove build metadata from libgit2-sys dependency

This removes the `+1.6.4` build metadata from the libgit2-sys dependency because it causes cargo to generate a warning every time it is used.

Author: bors

Cargo.toml

@@ -57,7 +57,7 @@ jobserver = "0.1.26"
 lazy_static = "1.4.0"
 lazycell = "1.3.0"
 libc = "0.2.147"
-libgit2-sys = "0.15.2+1.6.4"
+libgit2-sys = "0.15.2"
 log = "0.4.19"
 memchr = "2.5.0"
 miow = "0.5.0"