[fontconfig] fix dynamic linux build (#48682)

ports/fontconfig/dllexport.diff

@@ -23,7 +23,7 @@ index 1ad1e58..1d9ac14 100644
 +    if host_machine.system() == 'windows'
 +        default_FcPublic = '__declspec(dllimport)'
 +    else
-+        default_FcPublic = '__attribute__((visibility(\"default\")))'
++        default_FcPublic = '__attribute__((visibility("default")))'
 +    endif
 +endif
 +fontconfig_h_conf.set('DEFAULT_FCPUBLIC', default_FcPublic)

ports/fontconfig/vcpkg.json

@@ -1,6 +1,7 @@
 {
   "name": "fontconfig",
   "version": "2.17.1",
+  "port-version": 1,
   "description": "Library for configuring and customizing font access.",
   "homepage": "https://www.freedesktop.org/wiki/Software/fontconfig",
   "license": "MIT",

versions/baseline.json

@@ -3062,7 +3062,7 @@
     },
     "fontconfig": {
       "baseline": "2.17.1",
-      "port-version": 0
+      "port-version": 1
     },
     "foonathan-lexy": {
       "baseline": "2025.5.0",

versions/f-/fontconfig.json

@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "91f5aca0263a76ef0580e8250dcb01c0132f499e",
+      "version": "2.17.1",
+      "port-version": 1
+    },
     {
       "git-tree": "8aba281b89fc1f50ba3368df651e0b390f03f8c6",
       "version": "2.17.1",