Bump libgit2-sys to get it to compile on i686-pc-windows-gnu.

Cargo.lock

@@ -291,7 +291,7 @@ dependencies = [
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazycell 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
- "libgit2-sys 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libgit2-sys 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "memchr 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "miow 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1049,7 +1049,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
- "libgit2-sys 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libgit2-sys 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "openssl-probe 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "openssl-sys 0.9.43 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1360,7 +1360,7 @@ dependencies = [
 
 [[package]]
 name = "libgit2-sys"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cc 1.0.35 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4405,7 +4405,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum lazycell 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "b294d6fa9ee409a054354afc4352b0b9ef7ca222c69b8812cbea9e7d2bf3783f"
 "checksum leb128 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)" = "3576a87f2ba00f6f106fdfcd16db1d698d648a26ad8e0573cad8537c3c362d2a"
 "checksum libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)" = "c6785aa7dd976f5fbf3b71cfd9cd49d7f783c1ff565a858d71031c6c313aa5c6"
-"checksum libgit2-sys 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3cdc869f847995243b84e2f10226fe70afdd9f989c6fc4500d1ff53dd21cf43b"
+"checksum libgit2-sys 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "941a41e23f77323b8c9d2ee118aec9ee39dfc176078c18b4757d3bad049d9ff7"
 "checksum libnghttp2-sys 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d75d7966bda4730b722d1eab8e668df445368a24394bae9fc1e8dc0ab3dbe4f4"
 "checksum libssh2-sys 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)" = "126a1f4078368b163bfdee65fbab072af08a1b374a5551b21e87ade27b1fbf9d"
 "checksum libz-sys 1.0.25 (registry+https://github.com/rust-lang/crates.io-index)" = "2eb5e43362e38e2bca2fd5f5134c4d4564a23a5c28e9b95411652021a8675ebe"