Minor optimization in Utils.h_list

ChangeLog

@@ -13,3 +13,7 @@ NEW IN WAF 1.9
 * Made lazy visual studio detection the default
 * Flags given in the form ${FOO}${BAR} will be merged in commands executed without a shell
 * Added Task.get_cwd()
+* Enabled pre-forked builds by default
+* Modified the build scheduler to enable a consistent progress bar
+* Reduced the memory footprint of Task objects
+

waflib/Utils.py

@@ -547,9 +547,7 @@ def h_list(lst):
 	:type lst: list of strings
 	:return: hash of the list
 	"""
-	m = md5()
-	m.update(str(lst).encode())
-	return m.digest()
+	return md5(repr(lst).encode()).digest()
 
 def h_fun(fun):
 	"""