patch 9.0.1621: FILETYPE_FILE is defined to the same value multiple times

Problem:    FILETYPE_FILE is defined to the same value multiple times.  Same
            for a few similar macros.
Solution:   Define FILETYPE_FILE and others in feature.h only
diff --git a/src/version.c b/src/version.c
index bad9e54..e5cb446 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1621,
+/**/
     1620,
 /**/
     1619,