libX11: Update version from 1.6.8 to 1.8.1

Update suffix to xz (LZMA).

libX11.be0

@@ -1,6 +1,6 @@
 #!/usr/bin/env beesh
 
-# BEE_VERSION libX11-1.6.8-0
+# BEE_VERSION libX11-1.8.1-0
 
 ## this file was created by bee init and should be executed to build a
 ## bee-package. (Additional hints are located at the end of this file.)
@@ -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]="https://www.x.org/releases/individual/lib/libX11-${PKGVERSION}.tar.bz2"
+SRCURL[0]="https://www.x.org/releases/individual/lib/libX11-${PKGVERSION}.tar.xz"
 
 ###############################################################################
 ## Add URLs/pathes to patch files to the PATCHURL array.