[config] Add HB_NO_UNISCRIBE_BUG_COMPATIBLE

Part of https://github.com/harfbuzz/harfbuzz/issues/1652
diff --git a/src/hb-config.hh b/src/hb-config.hh
index 2eab7d8..f6dc4fb 100644
--- a/src/hb-config.hh
+++ b/src/hb-config.hh
@@ -82,6 +82,10 @@
 #define HB_NO_SUBSET_CFF
 #endif
 
+#ifdef HB_NO_GETENV
+#define HB_NO_UNISCRIBE_BUG_COMPATIBLE
+#endif
+
 #ifdef HB_NO_LEGACY
 #define HB_NO_OT_LAYOUT_BLACKLIST
 #define HB_NO_OT_SHAPE_FALLBACK