Revert ad01c1b614

This change broke key names for dead keys, because that depends on
the effect on the global state of simulating two key presses.

Issue found by CTest tests.

Reverts #2018

src/win32_init.c

@@ -460,11 +460,6 @@ void _glfwUpdateKeyNamesWin32(void)
 {
     int key;
     BYTE state[256] = {0};
-    UINT flags = 0;
-
-    // Avoid modifying the global key state if supported
-    if (_glfwIsWindows10Version1607OrGreaterWin32())
-        flags = (1 << 2);
 
     memset(_glfw.win32.keynames, 0, sizeof(_glfw.win32.keynames));
 
@@ -494,13 +489,13 @@ void _glfwUpdateKeyNamesWin32(void)
 
         length = ToUnicode(vk, scancode, state,
                            chars, sizeof(chars) / sizeof(WCHAR),
-                           flags);
+                           0);
 
         if (length == -1)
         {
             length = ToUnicode(vk, scancode, state,
                                chars, sizeof(chars) / sizeof(WCHAR),
-                               flags);
+                               0);
         }
 
         if (length < 1)