Complete msvcrt (#4548)

stdlib/2and3/msvcrt.pyi

@@ -1,14 +1,24 @@
-# Stubs for msvcrt
+import sys
+from typing import Text
 
-# NOTE: These are incomplete!
-
-LK_LOCK: int
-LK_NBLCK: int
-LK_NBRLCK: int
-LK_RLCK: int
-LK_UNLCK: int
-
-def locking(__fd: int, __mode: int, __nbytes: int) -> None: ...
-def get_osfhandle(__fd: int) -> int: ...
-def open_osfhandle(__handle: int, __flags: int) -> int: ...
-def getch() -> bytes: ...
+# This module is only available on Windows
+if sys.platform == "win32":
+    LK_LOCK: int
+    LK_NBLCK: int
+    LK_NBRLCK: int
+    LK_RLCK: int
+    LK_UNLCK: int
+    def locking(__fd: int, __mode: int, __nbytes: int) -> None: ...
+    def setmode(__fd: int, __mode: int) -> int: ...
+    def open_osfhandle(__handle: int, __flags: int) -> int: ...
+    def get_osfhandle(__fd: int) -> int: ...
+    def kbhit() -> bool: ...
+    def getch() -> bytes: ...
+    def getwch() -> Text: ...
+    def getche() -> bytes: ...
+    def getwche() -> Text: ...
+    def putch(__char: bytes) -> None: ...
+    def putwch(__unicode_char: Text) -> None: ...
+    def ungetch(__char: bytes) -> None: ...
+    def ungetwch(__unicode_char: Text) -> None: ...
+    def heapmin() -> None: ...