patch 8.0.0364: ]s does not move cursor with two spell errors in one line

Problem:    ]s does not move cursor with two spell errors in one line. (Manuel
            Ortega)
Solution:   Don't stop search immediately when wrapped, search the line first.
            (Ken Takata)  Add a test.
diff --git a/src/Makefile b/src/Makefile
index 227e1df..5ed8362 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -2193,6 +2193,7 @@
 	test_smartindent \
 	test_sort \
 	test_source_utf8 \
+	test_spell \
 	test_startup \
 	test_startup_utf8 \
 	test_stat \