patch 8.0.0972: compiler warnings for unused variables

Problem:    Compiler warnings for unused variables. (Tony Mechelynck)
Solution:   Add #ifdefs.
diff --git a/src/term.c b/src/term.c
index 8fb3e12..44b196f 100644
--- a/src/term.c
+++ b/src/term.c
@@ -161,11 +161,13 @@
 
 static int  detected_8bit = FALSE;	/* detected 8-bit terminal */
 
+#ifdef FEAT_TERMRESPONSE
 /* When the cursor shape was detected these values are used:
  * 1: block, 2: underline, 3: vertical bar
  * initial_cursor_blink is only valid when initial_cursor_shape is not zero. */
 static int initial_cursor_shape = 0;
 static int initial_cursor_blink = FALSE;
+#endif
 
 static struct builtin_term builtin_termcaps[] =
 {
@@ -3714,9 +3716,11 @@
      * mode. */
     if (!full_screen || *T_CEI == NUL)
     {
+# ifdef FEAT_TERMRESPONSE
 	if (forced && initial_cursor_shape > 0)
 	    /* Restore to initial values. */
 	    term_cursor_shape(initial_cursor_shape, initial_cursor_blink);
+# endif
 	return;
     }