[flatbush] update to v1.2.1 (#38848)

Fix multiple definition error when `#include`d in more than one source
file
Address several findings reported by clang-tidy and other minor
fine-tunings
Ran through clang-format and include-what-you-use

- [x] Changes comply with the [maintainer
guide](https://github.com/microsoft/vcpkg-docs/blob/main/vcpkg/contributing/maintainer-guide.md).
- [x] SHA512s are updated for each updated download.
- [ ] The "supports" clause reflects platforms that may be fixed by this
new version.
- [ ] Any fixed [CI
baseline](https://github.com/microsoft/vcpkg/blob/master/scripts/ci.baseline.txt)
entries are removed from that file.
- [x] Any patches that are no longer applied are deleted from the port's
directory.
- [x] The version database is fixed by rerunning `./vcpkg x-add-version
--all` and committing the result.
- [x] Only one version is added to each modified port's versions file.

ports/flatbush/portfile.cmake

@@ -3,7 +3,7 @@ vcpkg_from_github(
     OUT_SOURCE_PATH SOURCE_PATH
     REPO chusitoo/flatbush
     REF "v${VERSION}"
-    SHA512 c2671a8885bc1299efdfa38f1947b98697aeb9ee156622cd71fbdf8a7741e5fa0306f5d85867e6dd683fb80c9d74fa9cd9809b47797183a0bbcab7ee57df165e
+    SHA512 6640265e921998d7de1fca8ee628007687081ba6ab1fb0bd5a0951eac0e76e59b89c441a9baf6abd90ec32271b943974bc8becb1ccfb36fe74811025106620de
     HEAD_REF master
 )
 

ports/flatbush/vcpkg.json

@@ -1,6 +1,6 @@
 {
   "name": "flatbush",
-  "version": "1.2.0",
+  "version": "1.2.1",
   "description": "A C++11 header-only single file port of Flatbush",
   "homepage": "https://github.com/chusitoo/flatbush",
   "license": "MIT",

versions/baseline.json

@@ -2749,7 +2749,7 @@
       "port-version": 0
     },
     "flatbush": {
-      "baseline": "1.2.0",
+      "baseline": "1.2.1",
       "port-version": 0
     },
     "flecs": {

versions/f-/flatbush.json

@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "64b18f219f0a4fb4f582364c6e3b0e636700cd86",
+      "version": "1.2.1",
+      "port-version": 0
+    },
     {
       "git-tree": "f9a8b3e1671e29e5a3ad36935f66f7d7bac0e0ab",
       "version": "1.2.0",