Add vcpkg support

Author: mborland

ports/int128/b2-options.cmake

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+# Copyright 2024 Matt Borland
+# Distributed under the Boost Software License, Version 1.0.
+# https://www.boost.org/LICENSE_1_0.txt
+
+if(APPLE)
+    list(APPEND B2_OPTIONS cxxstd=14)
+endif()

ports/int128/portfile.cmake

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+# Copyright 2024 Matt Borland
+# Distributed under the Boost Software License, Version 1.0.
+# https://www.boost.org/LICENSE_1_0.txt
+#
+# See: https://devblogs.microsoft.com/cppblog/registries-bring-your-own-libraries-to-vcpkg/
+
+vcpkg_from_github(
+        OUT_SOURCE_PATH SOURCE_PATH
+        REPO cppalliance/int128
+        REF v1.1.0
+        SHA512 f184f341b0a6afb83cfed6b1680356f20d6df01fcc9fedd901ecb27e87819f093c1d8acfc14d2a50335e20c5079f36ac6902c531cc96b1c4590d147edacf5e8f
+        HEAD_REF master
+)
+
+file(COPY "${SOURCE_PATH}/include" DESTINATION "${CURRENT_PACKAGES_DIR}")
+file(INSTALL "${SOURCE_PATH}/LICENSE" DESTINATION "${CURRENT_PACKAGES_DIR}/share/${PORT}" RENAME copyright)

ports/int128/vcpkg.json

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+{
+  "name": "int128",
+  "version": "1.1.0",
+  "description": "Portable and performant 128-bit integers",
+  "homepage": "https://github.com/cppalliance/int128",
+  "license": "BSL-1.0",
+  "dependencies": [
+    {
+      "name": "vcpkg-cmake",
+      "host": true
+    }
+    ]
+}