Use itertools.chain() instead of list concatenation

mesonbuild/backend/ninjabackend.py

@@ -1084,7 +1084,7 @@ int dummy;
         the build directory.
         """
         result = OrderedSet()
-        for dep in target.link_targets + target.link_whole_targets:
+        for dep in itertools.chain(target.link_targets, target.link_whole_targets):
             for i in dep.sources:
                 if hasattr(i, 'fname'):
                     i = i.fname

mesonbuild/build.py

@@ -798,7 +798,7 @@ This will become a hard error in a future Meson release.''')
 
     def get_dependencies(self):
         transitive_deps = []
-        for t in self.link_targets + self.link_whole_targets:
+        for t in itertools.chain(self.link_targets, self.link_whole_targets):
             transitive_deps.append(t)
             if isinstance(t, StaticLibrary):
                 transitive_deps += t.get_dependencies()