[sdl2] Add feature x11

[NancyLi1013]

Describe the pull request

• What does your PR fix?

  Fixes Failed to build sdl2:x64-linux on fedora #21148

Add feature x11, only supports on Unix.

Add message for feature x11.

Update deprecated functions.

Note: Feature x11 has passed on x64-linux.

[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 40a0fb232833dbc1b526394929f10b71627c2269 -- versions
./vcpkg x-add-version --all

Diff

diff --git a/versions/baseline.json b/versions/baseline.json
index 92986f0..70e0394 100644
--- a/versions/baseline.json
+++ b/versions/baseline.json
@@ -2130,7 +2130,7 @@
     },
     "ffmpeg": {
       "baseline": "4.4",
-      "port-version": 17
+      "port-version": 18
     },
     "ffnvcodec": {
       "baseline": "11.1.5.0",
@@ -2326,7 +2326,7 @@
     },
     "gamedev-framework": {
       "baseline": "0.20.0",
-      "port-version": 0
+      "port-version": 1
     },
     "gamenetworkingsockets": {
       "baseline": "1.3.0",
@@ -5202,7 +5202,7 @@
     },
     "pixel": {
       "baseline": "0.3",
-      "port-version": 2
+      "port-version": 3
     },
     "pixman": {
       "baseline": "0.40.0",
diff --git a/versions/f-/ffmpeg.json b/versions/f-/ffmpeg.json
index e288e83..0ec91d0 100644
--- a/versions/f-/ffmpeg.json
+++ b/versions/f-/ffmpeg.json
@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "fa1d927c640e5fc9abb088c7409e90057cd0b371",
+      "version": "4.4",
+      "port-version": 18
+    },
     {
       "git-tree": "795e31317ef58fbe13247af9e8bade71f3edde5e",
       "version": "4.4",
diff --git a/versions/g-/gamedev-framework.json b/versions/g-/gamedev-framework.json
index 89dccc8..624ae04 100644
--- a/versions/g-/gamedev-framework.json
+++ b/versions/g-/gamedev-framework.json
@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "a9771cd4f7093f5d34a78d3e2417707185444910",
+      "version-semver": "0.20.0",
+      "port-version": 1
+    },
     {
       "git-tree": "195d4f41db9d03aa44fa6cc0d984668115a17718",
       "version-semver": "0.20.0",
diff --git a/versions/p-/pixel.json b/versions/p-/pixel.json
index f3c7a02..d10f82c 100644
--- a/versions/p-/pixel.json
+++ b/versions/p-/pixel.json
@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "57198090e451e125ad231a0a1068643cbd06cb61",
+      "version-string": "0.3",
+      "port-version": 3
+    },
     {
       "git-tree": "bd45dec4585e8be40088a7017dcce546a009748f",
       "version-string": "0.3",
diff --git a/versions/s-/sdl2.json b/versions/s-/sdl2.json
index 97b835b..2c1bd7f 100644
--- a/versions/s-/sdl2.json
+++ b/versions/s-/sdl2.json
@@ -1,7 +1,7 @@
 {
   "versions": [
     {
-      "git-tree": "946628e2d440c855802b11384b6875633b7d642d",
+      "git-tree": "120b4a3f60f1b2bfc0f20a7c20b5494fff8ea519",
       "version": "2.0.16",
       "port-version": 2
     },