rdstdin: remove cruft that shouldn't have been exported or added (#12014)

lib/impure/rdstdin.nim

@@ -33,46 +33,6 @@ when defined(Windows):
     stdout.write(prompt)
     result = readLine(stdin, line)
 
-  import winlean
-
-  const
-    VK_SHIFT* = 16
-    VK_CONTROL* = 17
-    VK_MENU* = 18
-    KEY_EVENT* = 1
-
-  type
-    KEY_EVENT_RECORD = object
-      bKeyDown: WINBOOL
-      wRepeatCount: uint16
-      wVirtualKeyCode: uint16
-      wVirtualScanCode: uint16
-      unicodeChar: uint16
-      dwControlKeyState: uint32
-    INPUT_RECORD = object
-      eventType*: int16
-      reserved*: int16
-      event*: KEY_EVENT_RECORD
-      safetyBuffer: array[0..5, DWORD]
-
-  proc readConsoleInputW*(hConsoleInput: Handle, lpBuffer: var INPUT_RECORD,
-                          nLength: uint32,
-                          lpNumberOfEventsRead: var uint32): WINBOOL{.
-      stdcall, dynlib: "kernel32", importc: "ReadConsoleInputW".}
-
-  proc getch(): uint16 =
-    let hStdin = getStdHandle(STD_INPUT_HANDLE)
-    var
-      irInputRecord: INPUT_RECORD
-      dwEventsRead: uint32
-
-    while readConsoleInputW(hStdin, irInputRecord, 1, dwEventsRead) != 0:
-      if irInputRecord.eventType == KEY_EVENT and
-          irInputRecord.event.wVirtualKeyCode notin {VK_SHIFT, VK_MENU, VK_CONTROL}:
-         result = irInputRecord.event.unicodeChar
-         discard readConsoleInputW(hStdin, irInputRecord, 1, dwEventsRead)
-         return result
-
 elif defined(genode):
   proc readLineFromStdin*(prompt: string): TaintedString {.
                           tags: [ReadIOEffect, WriteIOEffect].} =