patch 9.0.0658: tiny build fails on Mac OS

Problem:    Tiny build fails on Mac OS.
Solution:   Define FEAT_CLIPBOARD only for normal build.
diff --git a/src/vim.h b/src/vim.h
index 17cc7b8..4a77dec 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -163,7 +163,8 @@
  */
 #include "feature.h"
 
-#if defined(MACOS_X_DARWIN) && !defined(FEAT_CLIPBOARD)
+#if defined(MACOS_X_DARWIN) && defined(FEAT_NORMAL) \
+	&& !defined(FEAT_CLIPBOARD)
 # define FEAT_CLIPBOARD
 #endif