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/globals.h b/src/globals.h
index d0938fd..d420560 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -1671,6 +1671,10 @@
 EXTERN int *eval_lavars_used INIT(= NULL);
 #endif
 
+#ifdef WIN3264
+EXTERN int ctrl_break_was_pressed = FALSE;
+#endif
+
 /*
  * Optional Farsi support.  Include it here, so EXTERN and INIT are defined.
  */