[libwebp] Update, cleanup

[dg0yt]

• What does your PR fix?

  Updates libwebp to 1.2.2.
  Cleanup of features, portfile, patches.
  Drop non-standard debug postfix.
  Drop non-standard config polyfill.

• Which triplets are supported/not supported? Have you updated the CI baseline?

  unchanged, no

• Does your PR follow the maintainer guide?

  yes

• If you have added/updated a port: Have you run ./vcpkg x-add-version --all and committed the result?

  yes

[github-actions]

This is a new experimental fast check for PR issues. Please let us know if this bot is helpful!

After committing all other changes, the version database must be updated

git add -u && git commit
git checkout 4f778cf094a65f836167eb301bdf62b7ba632c68 -- versions
./vcpkg x-add-version --all

Diff

diff --git a/versions/baseline.json b/versions/baseline.json
index 851d4de..723f144 100644
--- a/versions/baseline.json
+++ b/versions/baseline.json
@@ -4141,7 +4141,7 @@
       "port-version": 1
     },
     "libwebp": {
-      "baseline": "1.2.1",
+      "baseline": "1.2.2",
       "port-version": 0
     },
     "libwebsockets": {
diff --git a/versions/l-/libwebp.json b/versions/l-/libwebp.json
index 935958c..a188e24 100644
--- a/versions/l-/libwebp.json
+++ b/versions/l-/libwebp.json
@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "d09abc022500076444cb82cb2cc0a90a1c1668f3",
+      "version": "1.2.2",
+      "port-version": 0
+    },
     {
       "git-tree": "ca5a8b2ed264617e8a35d22e1e6ac18ebe99900f",
       "version": "1.2.1",

You have modified or added at least one vcpkg.json where a "license" field is missing.

If you feel able to do so, please consider adding a "license" field to the following files:

• ports/libwebp/vcpkg.json

Valid values for the license field can be found in the documentation

[github-actions]

You have modified or added at least one vcpkg.json where a "license" field is missing.

If you feel able to do so, please consider adding a "license" field to the following files:

• ports/libwebp/vcpkg.json
• ports/osgearth/vcpkg.json
• ports/skia/vcpkg.json

Valid values for the license field can be found in the documentation

[github-actions]

You have modified or added at least one vcpkg.json where a "license" field is missing.

If you feel able to do so, please consider adding a "license" field to the following files:

• ports/libwebp/vcpkg.json
• ports/osgearth/vcpkg.json
• ports/skia/vcpkg.json

Valid values for the license field can be found in the documentation

[Cheney-W]

All features passed with x64-windows triplet.

[strega-nil-ms]

Thanks!