cmake: Fix building with latest libuv

packages/cmake/Source-Modules-FindLibUV.cmake.patch

@@ -0,0 +1,23 @@
+commit 6ad09a5d14ef497cca653d303c3849f83aa0aca3
+Author: Raphael Kubo da Costa <rakuco@FreeBSD.org>
+Date:   Sat Jun 23 20:30:07 2018 +0200
+	
+FindLibUV: Also check uv/version.h for version detection
+
+Starting with libuv 1.21.0, libuv's headers were moved into a uv/ directory.
+Make FindLibUV aware of the file's new location for configuration to work.
+
+Upstream change: https://github.com/libuv/libuv/pull/1429
+
+diff -u -r ../cmake-3.11.4/Source/Modules/FindLibUV.cmake ./Source/Modules/FindLibUV.cmake
+--- ../cmake-3.11.4/Source/Modules/FindLibUV.cmake	2018-06-14 12:57:31.000000000 +0000
++++ ./Source/Modules/FindLibUV.cmake	2018-06-26 09:33:28.391957459 +0000
+@@ -63,6 +63,8 @@
+ set(_LibUV_H_REGEX "#[ \t]*define[ \t]+UV_VERSION_(MAJOR|MINOR|PATCH)[ \t]+[0-9]+")
+ if(LibUV_INCLUDE_DIR AND EXISTS "${LibUV_INCLUDE_DIR}/uv-version.h")
+   file(STRINGS "${LibUV_INCLUDE_DIR}/uv-version.h" _LibUV_H REGEX "${_LibUV_H_REGEX}")
++elseif(LibUV_INCLUDE_DIR AND EXISTS "${LibUV_INCLUDE_DIR}/uv/version.h")
++  file(STRINGS "${LibUV_INCLUDE_DIR}/uv/version.h" _LibUV_H REGEX "${_LibUV_H_REGEX}")
+ elseif(LibUV_INCLUDE_DIR AND EXISTS "${LibUV_INCLUDE_DIR}/uv.h")
+   file(STRINGS "${LibUV_INCLUDE_DIR}/uv.h" _LibUV_H REGEX "${_LibUV_H_REGEX}")
+ else()