Merge branch 'feat/drop_msys' into 'master'

Tools: Remove MSYS/Mingw support

Closes IDF-3954

See merge request espressif/esp-idf!15862

tools/idf.py

@@ -784,25 +784,9 @@ def _find_usable_locale():
 
 if __name__ == '__main__':
     try:
-        # On MSYS2 we need to run idf.py with "winpty" in order to be able to cancel the subprocesses properly on
-        # keyboard interrupt (CTRL+C).
-        # Using an own global variable for indicating that we are running with "winpty" seems to be the most suitable
-        # option as os.environment['_'] contains "winpty" only when it is run manually from console.
-        WINPTY_VAR = 'WINPTY'
-        WINPTY_EXE = 'winpty'
-        if ('MSYSTEM' in os.environ) and (not os.environ.get('_', '').endswith(WINPTY_EXE)
-                                          and WINPTY_VAR not in os.environ):
-
-            if 'menuconfig' in sys.argv:
-                # don't use winpty for menuconfig because it will print weird characters
-                main()
-            else:
-                os.environ[WINPTY_VAR] = '1'  # the value is of no interest to us
-                # idf.py calls itself with "winpty" and WINPTY global variable set
-                ret = subprocess.call([WINPTY_EXE, sys.executable] + sys.argv, env=os.environ)
-                if ret:
-                    raise SystemExit(ret)
-
+        if 'MSYSTEM' in os.environ:
+            print_warning('MSys/Mingw is no longer supported. Please follow the getting started guide of the '
+                          'documentation in order to set up a suitiable environment, or continue at your own risk.')
         elif os.name == 'posix' and not _valid_unicode_config():
             # Trying to find best utf-8 locale available on the system and restart python with it
             best_locale = _find_usable_locale()