Merge topic 'import-libuv'

39ac889d cmake: Add trivial usage of libuv
7cf369fe Do not build libuv on HP-UX
075cae51 Do not build libuv on SPARC
9a53af40 Do not build libuv on Cygwin
219f7411 Do not build libuv on Mac OS X 10.4 and lower
8a5beef3 Add option to build CMake against a system libuv
e56aa462 FindLibUV: Add module to find libuv package
551d5aed libuv: Fix unused variable warning in uv_loop_close
f4f8074b libuv: Avoid including macOS CoreServices header globally
a63aaaed libuv: Always include our own header first
9130b53a libuv: Conditionally declare Windows APIs for VS 2008 and below
b52afa46 libuv: Fix anonymous union syntax
05dbc204 libuv: Fix Windows API function typedef syntax
75139374 libuv: Install LICENSE file with CMake documentation
95dcc4e4 libuv: Disable warnings to avoid changing 3rd party code
13b7e758 libuv: Build the library within CMake
...

Utilities/Scripts/update-libuv.bash

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+
+set -e
+set -x
+shopt -s dotglob
+
+readonly name="libuv"
+readonly ownership="libuv upstream <libuv@googlegroups.com>"
+readonly subtree="Utilities/cmlibuv"
+readonly repo="https://github.com/libuv/libuv.git"
+readonly tag="v1.x"
+readonly shortlog=false
+readonly paths="
+  LICENSE
+  include
+  src
+"
+
+extract_source () {
+    git_archive
+    pushd "${extractdir}/${name}-reduced"
+    echo "* -whitespace" > .gitattributes
+    popd
+}
+
+. "${BASH_SOURCE%/*}/update-third-party.bash"