Update to last version of lzma.

dependencies.py

@@ -81,8 +81,9 @@ class lzma(Dependency):
     name = 'lzma'
 
     class Source(ReleaseDownload):
-        archive = Remotefile('xz-5.0.4.tar.bz2',
-                             '5cd9b060d3a1ad396b3be52c9b9311046a1c369e6062aea752658c435629ce92')
+        archive = Remotefile('xz-5.2.3.tar.bz2',
+                             'fd9ca16de1052aac899ad3495ad20dfa906c27b4a5070102a2ec35ca3a4740c1',
+                             'https://tukaani.org/xz/xz-5.2.3.tar.bz2')
 
     class Builder(MakeBuilder):
         @property

dependency_versions.py

@@ -15,7 +15,7 @@ base_deps_meta_version = '1'
 
 base_deps_versions = {
   'zlib' : '1.2.8',
-  'lzma' : '5.0.4',
+  'lzma' : '5.2.3',
   'uuid' : '1.43.4',
   'xapian-core' : '1.4.5',
   'ctpp2' : '2.8.3',