rust: move Cargo.lock

If you do a `cargo build` in rust/, Cargo will create rust/Cargo.lock.
Furthermore, the previous rust/hgcli/Cargo.lock appears to not even be
consulted because the auto-generated rust/Cargo.lock varied from
rust/hgcli/Cargo.lock.

This commit moves Cargo.lock to where Cargo expects it to be.

While we're here, bump the version of libc to the latest available.

Differential Revision: https://phab.mercurial-scm.org/D1844

rust/Cargo.lock

@@ -1,127 +1,127 b''
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 version = "0.5.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
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 ]
 
 [[package]]
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 version = "0.1.0"
 source = "git+https://github.com/indygreg/rust-cpython.git?rev=c90d65cf84abfffce7ef54476bbfed56017a2f52#c90d65cf84abfffce7ef54476bbfed56017a2f52"
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  "python27-sys 0.1.2 (git+https://github.com/indygreg/rust-cpython.git?rev=c90d65cf84abfffce7ef54476bbfed56017a2f52)",
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- "libc 0.2.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.35 (registry+https://github.com/rust-lang/crates.io-index)",
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 ]
 
 [[package]]
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-version = "0.2.34"
+version = "0.2.35"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.35 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
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 version = "0.1.41"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
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+ "libc 0.2.35 (registry+https://github.com/rust-lang/crates.io-index)",
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 ]
 
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 [[package]]
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 dependencies = [
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.35 (registry+https://github.com/rust-lang/crates.io-index)",
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 [[package]]
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
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 [[package]]
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "winapi"
 version = "0.2.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "winapi-build"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
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