Update the MinGW Arch Linux package to point to the AUR

MinGW is no longer part of the official repositories.
The AUR must now be used to install MinGW.

This closes #2157.

development/compiling/compiling_for_windows.rst

@@ -151,29 +151,29 @@ If you are a Linux or macOS user, you need to install
 and 64-bit variants. The package names may differ based on your distribution,
 here are some known ones:
 
-+---------------+--------------------------------------------------------------+
-| **Arch**      | ::                                                           |
-|               |                                                              |
-|               |     pacman -S mingw-w64-gcc                                  |
-+---------------+--------------------------------------------------------------+
-| **Debian** /  | ::                                                           |
-| **Ubuntu**    |                                                              |
-|               |     apt install mingw-w64                                    |
-+---------------+--------------------------------------------------------------+
-| **Fedora**    | ::                                                           |
-|               |                                                              |
-|               |     dnf install mingw64-gcc-c++ mingw64-winpthreads-static \ |
-|               |                 mingw32-gcc-c++ mingw32-winpthreads-static   |
-+---------------+--------------------------------------------------------------+
-| **macOS**     | ::                                                           |
-|               |                                                              |
-|               |     brew install mingw-w64                                   |
-+---------------+--------------------------------------------------------------+
-| **Mageia**    | ::                                                           |
-|               |                                                              |
-|               |     urpmi mingw64-gcc-c++ mingw64-winpthreads-static \       |
-|               |           mingw32-gcc-c++ mingw32-winpthreads-static         |
-+---------------+--------------------------------------------------------------+
++----------------+--------------------------------------------------------------+
+| **Arch Linux** | Install `mingw-w64-gcc from the AUR`_.                       |
++----------------+--------------------------------------------------------------+
+| **Debian** /   | ::                                                           |
+| **Ubuntu**     |                                                              |
+|                |     apt install mingw-w64                                    |
++----------------+--------------------------------------------------------------+
+| **Fedora**     | ::                                                           |
+|                |                                                              |
+|                |     dnf install mingw64-gcc-c++ mingw64-winpthreads-static \ |
+|                |                 mingw32-gcc-c++ mingw32-winpthreads-static   |
++----------------+--------------------------------------------------------------+
+| **macOS**      | ::                                                           |
+|                |                                                              |
+|                |     brew install mingw-w64                                   |
++----------------+--------------------------------------------------------------+
+| **Mageia**     | ::                                                           |
+|                |                                                              |
+|                |     urpmi mingw64-gcc-c++ mingw64-winpthreads-static \       |
+|                |           mingw32-gcc-c++ mingw32-winpthreads-static         |
++----------------+--------------------------------------------------------------+
+
+.. _mingw-w64-gcc from the AUR: https://aur.archlinux.org/packages/mingw-w64-gcc/
 
 Before attempting the compilation, SCons will check for
 the following binaries in your ``PATH`` environment variable::