patch 8.0.0994: MS-Windows: cursor in terminal blinks undesirably

Problem:    MS-Windows: cursor in terminal blinks even though the blinking
            cursor was disabled on the system.
Solution:   Use GetCaretBlinkTime(). (Ken Takata)
diff --git a/src/terminal.c b/src/terminal.c
index c559d11..c6dc0d9 100644
--- a/src/terminal.c
+++ b/src/terminal.c
@@ -2311,10 +2311,12 @@
 
     /* For unix do not use a blinking cursor.  In an xterm this causes the
      * cursor to blink if it's blinking in the xterm.
-     * We do want a blinking cursor by default on Windows, since that's what
-     * the default is for a console. */
+     * For Windows we respect the system wide setting. */
 #ifdef WIN3264
-    value.boolean = 1;
+    if (GetCaretBlinkTime() == INFINITE)
+	value.boolean = 0;
+    else
+	value.boolean = 1;
 #else
     value.boolean = 0;
 #endif