liblzma: Revise update script to get version 5.0.8

Utilities/Scripts/update-liblzma.bash

@@ -8,7 +8,7 @@ readonly name="liblzma"
 readonly ownership="liblzma upstream <[email protected]>"
 readonly subtree="Utilities/cmliblzma"
 readonly repo="http://git.tukaani.org/xz.git"
-readonly tag="v5.0.5"
+readonly tag="v5.0.8"
 readonly shortlog=false
 readonly paths="
   COPYING