(from Yitzhak) ALT-H

This patch disables ALT-H in NetHack mode.  Before patch: ALT-H in NetHack
mode brings down the Help menu in the menu bar.  After patch: ALT-H does
nothing in NetHack mode.  In both cases, in Windows mode, ALT-H brings
down the Help menu in the menu bar.   I can easily write a patch to have
ALT-H in NetHack mode act the same as '?'.

Explanation:
return 0: this window proc has processed this event.
return DefWindowProc(): process using default window proc.

ALT-H is the only key for which DefWindowProc() does something special AND
reaches the else.

win/win32/mhmain.c

@@ -386,8 +386,7 @@ LRESULT CALLBACK MainWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lPar
 		    NHEVENT_KBD(M(tolower(c)));
 		} else if (scancode == (SCANLO + SIZE(scanmap)) - 1) {
 		    NHEVENT_KBD(M('?'));
-		} else
-		    return DefWindowProc(hWnd, message, wParam, lParam);
+		}
 		return 0;
             }
             return DefWindowProc(hWnd, message, wParam, lParam);