[libheif] x265 as feature to allow non-GPL build (#36857)

x265 is still included as a default feature when installed as:

`vcpkg.exe install libheif`

but to avoid linking to a GPL library, x265 can now be optionally
excluded with:

`vcpkg.exe install libheif[core,libde265]`

 (libheif cannot encode without x265, only decode)

### Checklist
(please forgive if completed inaccurately)

- [✔️] Changes comply with the [maintainer
guide](https://github.com/microsoft/vcpkg-docs/blob/main/vcpkg/contributing/maintainer-guide.md).
- [N/A ] The name of the port matches an existing name for this
component on https://repology.org/ if possible, and/or is strongly
associated with that component on search engines.
- [N/A] Optional dependencies are resolved in exactly one way. For
example, if the component is built with CMake, all `find_package` calls
are REQUIRED, are satisfied by `vcpkg.json`'s declared dependencies, or
disabled with
[CMAKE_DISABLE_FIND_PACKAGE_Xxx](https://cmake.org/cmake/help/latest/variable/CMAKE_DISABLE_FIND_PACKAGE_PackageName.html).
- [ N/A] The versioning scheme in `vcpkg.json` matches what upstream
says.
- [N/A] The license declaration in `vcpkg.json` matches what upstream
says.
- [ N/A] The installed as the "copyright" file matches what upstream
says.
- [ N/A] The source code of the component installed comes from an
authoritative source.
- [ N/A ?] The generated "usage text" is accurate. See
[adding-usage](https://github.com/microsoft/vcpkg-docs/blob/main/vcpkg/examples/adding-usage.md)
for context.
- [ N/A] The version database is fixed by rerunning `./vcpkg
x-add-version --all` and committing the result.
- [ N/A] Only one version is in the new port's versions file.
- [ N/A] Only one version is added to each modified port's versions
file.

---------

Co-authored-by: Lily Wang <94091114+LilyWangLL@users.noreply.github.com>

ports/libheif/portfile.cmake

@@ -8,12 +8,18 @@ vcpkg_from_github(
         gdk-pixbuf.patch
 )
 
+vcpkg_check_features(OUT_FEATURE_OPTIONS FEATURE_OPTIONS
+	FEATURES
+		hevc    WITH_X265
+)
+
 vcpkg_cmake_configure(
     SOURCE_PATH "${SOURCE_PATH}"
     OPTIONS
         -DWITH_EXAMPLES=OFF
         -DWITH_DAV1D=OFF
         -DPKG_CONFIG_USE_CMAKE_PREFIX_PATH=ON
+        ${FEATURE_OPTIONS}
 )
 vcpkg_cmake_install()
 vcpkg_copy_pdbs()

ports/libheif/vcpkg.json

@@ -1,6 +1,7 @@
 {
   "name": "libheif",
   "version": "1.17.6",
+  "port-version": 1,
   "description": "libheif is an HEIF and AVIF file format decoder and encoder.",
   "homepage": "http://www.libheif.org/",
   "license": "LGPL-3.0-only",
@@ -18,7 +19,18 @@
     {
       "name": "vcpkg-cmake-config",
       "host": true
-    },
-    "x265"
-  ]
+    }
+  ],
+  "default-features": [
+    "hevc"
+  ],
+  "features": {
+    "hevc": {
+      "description": "HEVC encoding via x265",
+      "license": "GPL-2.0-or-later",
+      "dependencies": [
+        "x265"
+      ]
+    }
+  }
 }

versions/baseline.json

@@ -4434,7 +4434,7 @@
     },
     "libheif": {
       "baseline": "1.17.6",
-      "port-version": 0
+      "port-version": 1
     },
     "libhsplasma": {
       "baseline": "2023-05-08",

versions/l-/libheif.json

@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "09b2045951b7521e2d597082009265a70427581d",
+      "version": "1.17.6",
+      "port-version": 1
+    },
     {
       "git-tree": "b5871a26f6e90560089b413fc136e7f0062885b8",
       "version": "1.17.6",