libXrandr: Use new, secure source URL

The current URL moved permanently.

```
$ curl -I http://xorg.freedesktop.org/releases/individual/lib/
HTTP/1.1 301 Moved Permanently
Date: Fri, 17 Nov 2017 11:21:44 GMT
Server: Apache/2.4.10 (Debian)
Location: https://www.x.org/releases/individual/lib/
Content-Type: text/html; charset=iso-8859-1

```

libXrandr.be0

@@ -9,7 +9,7 @@
 ## The source URL(s) define the location of the sources that will be
 ## downloaded. Version variables may be used to simplify reuse of this bee-file.
 
-SRCURL[0]="http://xorg.freedesktop.org/releases/individual/lib/libXrandr-${PKGVERSION}.tar.bz2"
+SRCURL[0]="https://www.x.org/releases/individual/lib/libXrandr-${PKGVERSION}.tar.bz2"
 
 ###############################################################################
 ## Add URLs/pathes to patch files to the PATCHURL array.