ensure that the drive letters are properly handled when dealing with foreign files

waflib/Node.py

@@ -684,6 +684,8 @@ class Node(object):
 			cur = cur.parent
 		# the file is external to the current project, make a fake root in the current build directory
 		lst.reverse()
+		if lst and Utils.is_win32 and len(lst[0]) == 2 and lst[0].endswith(':'):
+			lst[0] = lst[0][0]
 		return self.ctx.bldnode.make_node(['__root__'] + lst)
 
 	def find_resource(self, lst):