patch 8.1.1621: Amiga: time.h included twice

Problem:    Amiga: time.h included twice.
Solution:   Remove include from evalfunc.c, move outside of #ifdef in
            os_amiga.h. (Ola Söder, closes #4607)
diff --git a/src/version.c b/src/version.c
index 9af8988..8fd5239 100644
--- a/src/version.c
+++ b/src/version.c
@@ -778,6 +778,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1621,
+/**/
     1620,
 /**/
     1619,