[config] Make HB_DISABLE_DEPRECATED actually compile

Part of https://github.com/harfbuzz/harfbuzz/issues/1652
diff --git a/src/hb-config.hh b/src/hb-config.hh
index bd1becb..087e669 100644
--- a/src/hb-config.hh
+++ b/src/hb-config.hh
@@ -41,6 +41,7 @@
 #endif
 
 #ifdef HB_LEAN
+#define HB_DISABLE_DEPRECATED
 #define HB_NO_BITMAP
 #define HB_NO_CFF
 #define HB_NO_MATH
@@ -54,6 +55,12 @@
 
 /* Closure. */
 
+#ifdef HB_DISABLE_DEPRECATED
+#define HB_IF_NOT_DEPRECATED(x)
+#else
+#define HB_IF_NOT_DEPRECATED(x) x
+#endif
+
 #ifdef HB_NO_AAT
 #define HB_NO_SHAPE_AAT
 #endif