patch 8.2.1648: Amiga: no common build file for Amiga (-like) systems

Problem:    Amiga: no common build file for Amiga (-like) systems.
Solution:   Turn Make_morph.mak into Make_ami.mak. (Ola Söder, closes #6805)
diff --git a/src/version.c b/src/version.c
index 5cb8df0..5632a9f 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1648,
+/**/
     1647,
 /**/
     1646,