Remove HB_NO_OPTIONS in favor of HB_NO_GETENV

Part of https://github.com/harfbuzz/harfbuzz/issues/1652

src/hb-debug.hh

diff --git a/src/hb-debug.hh b/src/hb-debug.hh
index 0069605..e5328e9 100644
--- a/src/hb-debug.hh
+++ b/src/hb-debug.hh
@@ -63,7 +63,7 @@
 static inline hb_options_t
 hb_options ()
 {
-#if defined(HB_NO_OPTIONS)
+#if defined(HB_NO_GETENV)
   return hb_options_t ();
 #endif
   /* Make a local copy, so we can access bitfield threadsafely. */