[aur-general] removal requests

[Schala Zeal]

With the purpose of mingw-w64-* packages being dual 32/64-bit, I feel 
really uneasy about my lib32-mingw-w64-* packages. Looks like no one 
uses them anyway.

https://aur.archlinux.org/packages/lib32-mingw-w64-allegro4/
https://aur.archlinux.org/packages/lib32-mingw-w64-allegro4-static/
https://aur.archlinux.org/packages/lib32-mingw-w64-apr/
https://aur.archlinux.org/packages/lib32-mingw-w64-apr-util/
https://aur.archlinux.org/packages/lib32-mingw-w64-atkmm/
https://aur.archlinux.org/packages/lib32-mingw-w64-graphite/
https://aur.archlinux.org/packages/lib32-mingw-w64-gtk2/
https://aur.archlinux.org/packages/lib32-mingw-w64-gtkglext/
https://aur.archlinux.org/packages/lib32-mingw-w64-gtkglextmm/
https://aur.archlinux.org/packages/lib32-mingw-w64-gtkmm/
https://aur.archlinux.org/packages/lib32-mingw-w64-gtksourceview2/
https://aur.archlinux.org/packages/lib32-mingw-w64-libgcrypt/
https://aur.archlinux.org/packages/lib32-mingw-w64-luajit/
https://aur.archlinux.org/packages/lib32-mingw-w64-pangomm/
https://aur.archlinux.org/packages/lib32-mingw-w64-ptlib/
https://aur.archlinux.org/packages/lib32-mingw-w64-wxmsw/
https://aur.archlinux.org/packages/lib32-mingw-w64-wxmsw-static/