libxml2/2.13.6

[luoliwoshang]

conan install --requires libxml2/2.13.6 --generator PkgConfigDeps --options=\*:shared=True --options=iconv=False --build=missing --output-folder=./build && export PKG_CONFIG_PATH=$PWD/build:$PKG_CONFIG_PATH

temp use iconv=False to avoid depend libiconv

[MeteorsLiu]

This llpkg missed llpkg.cfg, which cannot pass Github Action verfication.
Here's the examplellpkg.cfg for this llpkg:

{
  "upstream": {
    "package": {
      "name": "libxml2",
      "version": "2.13.6"
    },
    "installer":{
      "name": "conan",
      "config" : {
        "options": "iconv=False"
      }
    }
  }
}