[libpq] explicitly disable emscripten support (#48489)

ports/libpq/vcpkg.json

@@ -1,11 +1,11 @@
 {
   "name": "libpq",
   "version": "16.9",
-  "port-version": 1,
+  "port-version": 2,
   "description": "The official database access API of postgresql",
   "homepage": "https://www.postgresql.org/",
   "license": "PostgreSQL",
-  "supports": "!uwp",
+  "supports": "!uwp & !emscripten",
   "dependencies": [
     {
       "name": "libpq",

versions/baseline.json

@@ -5350,7 +5350,7 @@
     },
     "libpq": {
       "baseline": "16.9",
-      "port-version": 1
+      "port-version": 2
     },
     "libpqxx": {
       "baseline": "7.10.1",

versions/l-/libpq.json

@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "d0e25acee8871632a68875de10a8b2803cad1d68",
+      "version": "16.9",
+      "port-version": 2
+    },
     {
       "git-tree": "8c588686c35f1f3f267750fdb82e32ee997ae2a8",
       "version": "16.9",