Remove also Ubuntu 16 and Debian 9 build instructions.

Author: levlam

build.html

@@ -241,9 +241,7 @@
       <option>CentOS 7</option>
       <option>CentOS 8</option>
       <option>CentOS Stream 9</option>
-      <option>Debian 9</option>
       <option>Debian 10+</option>
-      <option>Ubuntu 16</option>
       <option>Ubuntu 18</option>
       <option>Ubuntu 20</option>
       <option>Ubuntu 22</option>
@@ -869,9 +867,7 @@
         }
         commands.push(sudo + 'dnf install -y ' + packages);
         break;
-      case 'Debian 9':
       case 'Debian 10+':
-      case 'Ubuntu 16':
       case 'Ubuntu 18':
       case 'Ubuntu 20':
       case 'Ubuntu 22':