[subset] Fix infinite loop in there are more then 32 tables.
diff --git a/test/api/Makefile.am b/test/api/Makefile.am
index 54e367f..0e63b1d 100644
--- a/test/api/Makefile.am
+++ b/test/api/Makefile.am
@@ -31,6 +31,7 @@
 	test-object \
 	test-set \
 	test-shape \
+	test-subset \
 	test-subset-cmap \
 	test-subset-glyf \
 	test-subset-hdmx \