title: list of all available MinGW packages
body: <p>Following <a href="https://github.com/repology/repology-updater/issues/658#issuecomment-599682457" rel="nofollow noreferrer">this GitHub comment</a>, I was wondering if there is a place where one can fetch a list of all MinGW packages. Basically I'm looking for the repository/ies where <code>mingw-get</code> tool downloads the packages from. Looking at the internet <a href="http://www.mingw.org/PackageIdentificationHOWTO" rel="nofollow noreferrer">this page</a> explains the naming scheme of the packages and explains that there is a parser to interpret the package names. Also, <a href="http://mingw.5.n7.nabble.com/mingw-get-list-what-is-installed-td29994.html" rel="nofollow noreferrer">this page</a> explains that the list of all installed packages should be at stored at</p>
  
  <pre><code>$MINGW_ROOT/var/lib/mingw-get/data 
  </code></pre>
  
  <p>in some XML format but not all as far as I understand. Also <a href="https://github.com/msys2/MINGW-packages" rel="nofollow noreferrer">here</a> I can see the list of MSYS2-MinGW-W64 packages, but not sure if this is the place were <code>mingw-get</code> downloads the packages from.
  The final goal is to add the repository/ies to the Repology's <a href="https://repology.org/repositories/statistics" rel="nofollow noreferrer">list of repositories</a> and check how the packages are compared to other repositories. </p>
  
  <p><strong>P.S.</strong> I think I have found something.<a href="https://sourceforge.net/projects/mingw/files/Installer/mingw-get/catalogue/" rel="nofollow noreferrer">This catalog folder</a> on the MinGW SourceForge repository, contains a lot of XML files compressed in LZMA format. The <code>package-list.xml</code> points to three other XMLs <code>mingw32-package-list.xml</code>, <code>mingw32-contrib-package-list.xml</code>, and <code>msys-package-list.xml</code>. Consequently, they each point to the other XMLs for each individual package and their dependencies... I think that should be it. </p>