[config] Add HB_NO_OT_KERN, enabled by HB_MINI / HB_NO_LEGACY

Part of https://github.com/harfbuzz/harfbuzz/issues/1652
diff --git a/src/hb-ot-face-table-list.hh b/src/hb-ot-face-table-list.hh
index 74ee198..1dcfad4 100644
--- a/src/hb-ot-face-table-list.hh
+++ b/src/hb-ot-face-table-list.hh
@@ -50,7 +50,6 @@
 HB_OT_ACCELERATOR (OT, cmap)
 HB_OT_ACCELERATOR (OT, hmtx)
 HB_OT_ACCELERATOR (OT, post)
-HB_OT_TABLE (OT, kern)
 HB_OT_ACCELERATOR (OT, name)
 HB_OT_TABLE (OT, OS2)
 HB_OT_TABLE (OT, STAT)
@@ -73,6 +72,11 @@
 HB_OT_TABLE (OT, avar)
 HB_OT_TABLE (OT, MVAR)
 
+/* Legacy kern. */
+#ifndef HB_NO_OT_KERN
+HB_OT_TABLE (OT, kern)
+#endif
+
 /* OpenType shaping. */
 HB_OT_ACCELERATOR (OT, GDEF)
 HB_OT_ACCELERATOR (OT, GSUB)