post-install.py fails on Windows without pkg-config

Steps to reproduce

Try to build Gtk using MSVC:

In x64 Native Tools Command Prompt for VS 2019:

1. git clone git@gitlab.gnome.org:GNOME/gtk.git
2. cd gtk
3. mkdir build
4. cd build
5. meson --prefix %cd%\install
6. ninja
7. ninja install

Current behavior

post-install.py fails:

Running custom install script 'c:\\users\\aleksandr\\appdata\\local\\programs\\python\\python39\\python.exe C:\\Users\\Aleksandr\\gtk\\build-aux/meson/post-install.py 4.0 4.0.0 C:/Users/Aleksandr/gtk/build/install/lib C:/Users/Aleksandr/gtk/build/install/share C:/Users/Aleksandr/gtk/build/install/bin'
--- stdout ---
Compiling GSettings schemas...

--- stderr ---
Traceback (most recent call last):
  File "C:\Users\Aleksandr\gtk\build-aux\meson\post-install.py", line 19, in <module>
    glib_compile_schemas = subprocess.check_output(['pkg-config',
  File "c:\users\aleksandr\appdata\local\programs\python\python39\lib\subprocess.py", line 424, in check_output
    return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
  File "c:\users\aleksandr\appdata\local\programs\python\python39\lib\subprocess.py", line 505, in run
    with Popen(*popenargs, **kwargs) as process:
  File "c:\users\aleksandr\appdata\local\programs\python\python39\lib\subprocess.py", line 951, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "c:\users\aleksandr\appdata\local\programs\python\python39\lib\subprocess.py", line 1420, in _execute_child
    hp, ht, pid, tid = _winapi.CreateProcess(executable, args,
FileNotFoundError: [WinError 2] Не удается найти указанный файл

FAILED: install script 'c:\users\aleksandr\appdata\local\programs\python\python39\python.exe C:\Users\Aleksandr\gtk\build-aux/meson/post-install.py 4.0 4.0.0 C:/Users/Aleksandr/gtk/build/install/lib C:/Users/Aleksandr/gtk/build/install/share C:/Users/Aleksandr/gtk/build/install/bin' exit code 1, stopped

Expected outcome

I expected post-install.py to complete successfully.

Version information

• Gtk: commit 3aa89efcf452cd0066f6b1173bf8904ab0911134
• Windows 10
• MSVC 2019

Additional information

There is no pkg-config executable