Add multiple XML related extensions support for Windows (#349)

* update libxml2 version

* use msys2 tar.exe instead of system32/tar.exe

* add iconv, xml, dom, xmlreader, xmlwriter, soap, libxml, simplexml support

* add test

* add sysvshm support

* add quote

* add debug

* use mingw target

* fix windows tar

* fix windows tar

* fix windows tar

* fix windows tar

* fix windows tar [skip ci]

config/source.json

@@ -254,6 +254,15 @@
             "path": "COPYING"
         }
     },
+    "libiconv-win": {
+        "type": "git",
+        "rev": "master",
+        "url": "https://github.com/static-php/libiconv-win.git",
+        "license": {
+            "type": "file",
+            "path": "source/COPYING"
+        }
+    },
     "libjpeg": {
         "type": "ghtar",
         "repo": "libjpeg-turbo/libjpeg-turbo",
@@ -331,7 +340,7 @@
     },
     "libxml2": {
         "type": "url",
-        "url": "https://github.com/GNOME/libxml2/archive/refs/tags/v2.9.14.tar.gz",
+        "url": "https://github.com/GNOME/libxml2/archive/refs/tags/v2.12.5.tar.gz",
         "license": {
             "type": "file",
             "path": "Copyright"