Add m-esr52 at 52.6.0

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diff --git a/third_party/rust/pkg-config/README.md b/third_party/rust/pkg-config/README.md
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+# pkg-config-rs
+
+[![Build Status](https://travis-ci.org/alexcrichton/pkg-config-rs.svg?branch=master)](https://travis-ci.org/alexcrichton/pkg-config-rs)
+
+[Documentation](http://alexcrichton.com/pkg-config-rs)
+
+A simple library meant to be used as a build dependency with Cargo packages in
+order to use the system `pkg-config` tool (if available) to determine where a
+library is located.
+
+```rust
+extern crate pkg_config;
+
+fn main() {
+    pkg_config::find_library("foo").unwrap();
+}
+```
+
+# License
+
+`pkg-config-rs` is primarily distributed under the terms of both the MIT
+license and the Apache License (Version 2.0), with portions covered by various
+BSD-like licenses.
+
+See LICENSE-APACHE, and LICENSE-MIT for details.