patch 8.0.0918: cannot get terminal window cursor shape or attributes

Problem:    Cannot get terminal window cursor shape or attributes.
Solution:   Support cursor shape, attributes and color.
diff --git a/src/feature.h b/src/feature.h
index f77ffd6..ae3859b 100644
--- a/src/feature.h
+++ b/src/feature.h
@@ -1273,6 +1273,9 @@
 #if !defined(FEAT_JOB_CHANNEL) && defined(FEAT_TERMINAL)
 # undef FEAT_TERMINAL
 #endif
+#if defined(FEAT_TERMINAL) && !defined(CURSOR_SHAPE)
+# define CURSOR_SHAPE
+#endif
 
 /*
  * +signs		Allow signs to be displayed to the left of text lines.