Use https source

PKGBUILD

@@ -14,7 +14,7 @@ groups=('lxde')
 depends=('gtk2' 'startup-notification' 'lxmenu-data' 'menu-cache')
 makedepends=('intltool')
 backup=('etc/xdg/lxlauncher/gtkrc' 'etc/xdg/lxlauncher/settings.conf')
-source=(http://downloads.sourceforge.net/lxde/$pkgname-$pkgver.tar.xz)
+source=(https://downloads.sourceforge.net/lxde/$pkgname-$pkgver.tar.xz)
 md5sums=('94a7a36af92f8409365b6a25b6904eeb')
 
 build() {