[config] Replace HAVE_FALLBACK with HB_NO_FALLBACK_SHAPE
This disables fallback shaper in tiny builds. Projects that don't
use our build system and want to disable fallback shaper (eg. Firefox)
should define HB_NO_FALLBACK_SHAPE now.
Part of https://github.com/harfbuzz/harfbuzz/issues/1652
diff --git a/src/hb-shaper-list.hh b/src/hb-shaper-list.hh
index 25c584b..4108e7a 100644
--- a/src/hb-shaper-list.hh
+++ b/src/hb-shaper-list.hh
@@ -47,6 +47,6 @@
HB_SHAPER_IMPLEMENT (coretext)
#endif
-#ifdef HAVE_FALLBACK
+#ifndef HB_NO_FALLBACK_SHAPE
HB_SHAPER_IMPLEMENT (fallback) /* <--- This should be last. */
#endif
