[cppwinrt] Update to version 2.0.201008.2 (#14092)

ports/cppwinrt/CONTROL

@@ -1,4 +0,0 @@
-Source: cppwinrt
-Version: fall_2017_creators_update_for_vs_15.3-2
-Homepage: https://github.com/Microsoft/cppwinrt
-Description: C++/WinRT is a standard C++ language projection for the Windows Runtime.

ports/cppwinrt/portfile.cmake

@@ -1,21 +1,10 @@
-include(vcpkg_common_functions)
-
-vcpkg_from_github(
-    OUT_SOURCE_PATH SOURCE_PATH
-    REPO Microsoft/cppwinrt
-    REF fall_2017_creators_update_for_vs_15.3
-    SHA512 e3f987ed3f3dce019b8bf9f5451e53b42357473a003b8c14f9009e1848ee0463286bd46fdc3c739c8f7c2d232707e8018f5c087ffae784c745d51a8143f9a294
-    HEAD_REF master
+find_path(CPPWINRT_BASE_H
+    NAMES winrt/base.h
+    PATHS $ENV{INCLUDE}
 )
 
-# Put the licence file where vcpkg expects it
-file(COPY ${SOURCE_PATH}/LICENSE DESTINATION ${CURRENT_PACKAGES_DIR}/share/cppwinrt)
-file(RENAME ${CURRENT_PACKAGES_DIR}/share/cppwinrt/LICENSE ${CURRENT_PACKAGES_DIR}/share/cppwinrt/copyright)
+if(NOT CPPWINRT_BASE_H)
+    message(FATAL_ERROR "Unable to locate cppwinrt. Please install Windows SDK version 10.0.17134.0 or newer.")
+endif()
 
-# Copy the cppwinrt header files
-file(GLOB HEADER_FILES ${SOURCE_PATH}/10.0.16299.0/winrt/*)
-file(
-    COPY ${HEADER_FILES}
-    DESTINATION ${CURRENT_PACKAGES_DIR}/include/winrt
-    REGEX "\.(gitattributes|gitignore)$" EXCLUDE
-)
+SET(VCPKG_POLICY_EMPTY_PACKAGE enabled)

ports/cppwinrt/vcpkg.json

@@ -0,0 +1,7 @@
+{
+  "name": "cppwinrt",
+  "version-string": "windows-sdk",
+  "description": "C++/WinRT is a standard C++ language projection for the Windows Runtime.",
+  "homepage": "https://github.com/Microsoft/cppwinrt",
+  "supports": "windows"
+}