pyoxidizer: use `legacy_windows_stdio` on Windows

The C executable sets this too, otherwise no output shows up (when paging?).
There is also `legacy_windows_fs_encoding`, but I'm not setting that for now
because the C executable doesn't either.

Differential Revision: https://phab.mercurial-scm.org/D8053

contrib/packaging/pyoxidizer.bzl

@@ -1,57 +1,58 b''
 # Instructions:
 #
 # 1. cargo install --version 0.5.0 pyoxidizer
 # 2. cd /path/to/hg
 # 3. pyoxidizer build --path contrib/packaging [--release]
 # 4. Run build/pyoxidizer/<arch>/<debug|release>/app/hg
 #
 # If you need to build again, you need to remove the build/lib.* and
 # build/temp.* directories, otherwise PyOxidizer fails to pick up C
 # extensions. This is a bug in PyOxidizer.
 
 ROOT = CWD + "/../.."
 
 set_build_path(ROOT + "/build/pyoxidizer")
 
 def make_exe():
     dist = default_python_distribution()
 
     code = "import hgdemandimport; hgdemandimport.enable(); from mercurial import dispatch; dispatch.run()"
 
     config = PythonInterpreterConfig(
         raw_allocator = "system",
         run_eval = code,
         # We need this to make resourceutil happy, since it looks for sys.frozen.
         sys_frozen = True,
+        legacy_windows_stdio = True,
     )
 
     exe = dist.to_python_executable(
         name = "hg",
         config = config,
     )
 
     # Use setup.py install to build Mercurial and collect Python resources to
     # embed in the executable.
     resources = dist.setup_py_install(ROOT)
     exe.add_python_resources(resources)
 
     return exe
 
 def make_install(exe):
     m = FileManifest()
 
     # `hg` goes in root directory.
     m.add_python_resource(".", exe)
 
     templates = glob(
         include=[ROOT + "/mercurial/templates/**/*"],
         strip_prefix = ROOT + "/mercurial/",
     )
     m.add_manifest(templates)
 
     return m
 
 register_target("exe", make_exe)
 register_target("app", make_install, depends = ["exe"], default = True)
 
 resolve_targets()