patch 8.0.0913: MS-Windows: CTRL-C kills shell in terminal window

Problem:    MS-Windows: CTRL-C kills shell in terminal window instead of the
            command running in the shell.
Solution:   Make CTRL-C only send a CTRL_C_EVENT and have CTRL-BREAK kill the
            job. (partly by Yasuhiro Matsumoto, closes #1962)
diff --git a/src/os_win32.c b/src/os_win32.c
index add83d3..496f95f 100644
--- a/src/os_win32.c
+++ b/src/os_win32.c
@@ -6296,6 +6296,7 @@
 #ifndef FEAT_GUI_W32	    /* never used */
     if (g_fCtrlCPressed || g_fCBrkPressed)
     {
+	ctrl_break_was_pressed = g_fCBrkPressed;
 	g_fCtrlCPressed = g_fCBrkPressed = FALSE;
 	got_int = TRUE;
     }