[libpng] Enable NEON on arm64-linux (#38125)

<!-- If your PR fixes issues, please note that here by adding "Fixes
#NNNNNN." for each fixed issue on separate lines. -->
Fix https://github.com/microsoft/vcpkg/issues/38114
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https://github.blog/2019-02-14-introducing-draft-pull-requests/. -->

<!-- If this PR updates an existing port, please uncomment and fill out
this checklist:-->

- [x] Changes comply with the [maintainer
guide](https://github.com/microsoft/vcpkg-docs/blob/main/vcpkg/contributing/maintainer-guide.md).
- [ ] ~~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.~~
- [ ] ~~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/libpng/portfile.cmake

@@ -66,6 +66,10 @@ if(VCPKG_TARGET_IS_ANDROID)
     endif()
 endif()
 
+if(VCPKG_TARGET_ARCHITECTURE STREQUAL "arm64" AND VCPKG_TARGET_IS_LINUX)
+  vcpkg_list(APPEND LIBPNG_HARDWARE_OPTIMIZATIONS_OPTION "-DPNG_ARM_NEON=on")
+endif()
+
 vcpkg_cmake_configure(
     SOURCE_PATH "${SOURCE_PATH}"
     OPTIONS

ports/libpng/vcpkg.json

@@ -1,6 +1,7 @@
 {
   "name": "libpng",
   "version": "1.6.43",
+  "port-version": 1,
   "description": "libpng is a library implementing an interface for reading and writing PNG (Portable Network Graphics) format files",
   "homepage": "https://github.com/glennrp/libpng",
   "license": "libpng-2.0",

versions/baseline.json

@@ -4806,7 +4806,7 @@
     },
     "libpng": {
       "baseline": "1.6.43",
-      "port-version": 0
+      "port-version": 1
     },
     "libpopt": {
       "baseline": "1.16",

versions/l-/libpng.json

@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "1b0781214ef5a3497d0e7db2c0ed7f7fae74248b",
+      "version": "1.6.43",
+      "port-version": 1
+    },
     {
       "git-tree": "8673cfd41804628ce52c499b8d23c5696104ec47",
       "version": "1.6.43",