In some cases /showIncludes option emits dependencies to stdout, not …

…stderr

It contradicts its documentation: https://docs.microsoft.com/en-us/cpp/build/reference/showincludes-list-include-files?view=vs-2019

clade/extensions/cl.py

@@ -174,7 +174,7 @@ def __collect_deps(self, cmd_id, cmd, cmd_in):
         with open(deps_file, "wb") as deps_fh:
             proc = subprocess.Popen(
                 deps_cmd,
-                stdout=subprocess.DEVNULL,
+                stdout=deps_fh,
                 stderr=deps_fh,
                 cwd=cmd["cwd"],
                 shell=True,