Useless downloads from piston-meta

This is taken from 1.21 manifest:

{
      "downloads": {
        "artifact": {
          "path": "org/lwjgl/lwjgl-freetype/3.3.3/lwjgl-freetype-3.3.3-natives-windows-arm64.jar",
          "sha1": "82028265a0a2ff33523ca75137ada7dc176e5210",
          "size": 886068,
          "url": "https://libraries.minecraft.net/org/lwjgl/lwjgl-freetype/3.3.3/lwjgl-freetype-3.3.3-natives-windows-arm64.jar"
        }
      },
      "name": "org.lwjgl:lwjgl-freetype:3.3.3:natives-windows-arm64",
      "rules": [
        {
          "action": "allow",
          "os": {
            "name": "windows"
          }
        }
      ]
    },
    {
      "downloads": {
        "artifact": {
          "path": "org/lwjgl/lwjgl-freetype/3.3.3/lwjgl-freetype-3.3.3-natives-windows-x86.jar",
          "sha1": "15a8c1de7f51d07a92eae7ce1222557073a0c0c3",
          "size": 877480,
          "url": "https://libraries.minecraft.net/org/lwjgl/lwjgl-freetype/3.3.3/lwjgl-freetype-3.3.3-natives-windows-x86.jar"
        }
      },
      "name": "org.lwjgl:lwjgl-freetype:3.3.3:natives-windows-x86",
      "rules": [
        {
          "action": "allow",
          "os": {
            "name": "windows"
          }
        }
      ]
    },

As you can see, downloads for arm64 and x86 don't specify architecture in `rules` section. This causes launcher to download useless libraries and waste traffic and disk space.