Update boost to 1.84.0

Bump boost and perform housekeeping:

- Add LICENSE
- Add README
- Remove outdated README.Linden
- Remove 32-bit windows build
- Build PRs

.github/workflows/build.yaml

@@ -1,24 +1,20 @@
 name: Build
-on: [push]
+on:
+  pull_request:
+  push:
+    branches: [main]
+    tags: [v*]
 jobs:
   build:
     strategy:
       matrix:
-        os: [windows-2022, macos-11] ##, ubuntu-22.04]
-        addrsize: ["64"]
-        include:
-          - os: windows-2022
-            addrsize: "32"
+        os: [windows-2022, macos-13]
     runs-on: ${{ matrix.os }}
     steps:
       - uses: secondlife/action-autobuild@v3
-        with:
-          addrsize: ${{ matrix.addrsize }}
   release:
     needs: build
     runs-on: [ubuntu-latest]
     if: startsWith(github.ref, 'refs/tags/v')
     steps:
-      - uses: secondlife/action-autobuild-release@v3
-        with:
-          public: true
+      - uses: secondlife/action-autobuild-release@v3

.gitignore

@@ -0,0 +1,2 @@
+*.tar.*
+stage/

LICENSE

@@ -0,0 +1,25 @@
+This repository contains a vendored version of googlemock which maintains its own
+license and copyright information. See the contents of googlemock/ for more
+information.
+
+MIT License
+
+Copyright (c) 2024 Linden Research, Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.