Again remove now-stable feature gate flag

slightlyoutofphase · slightlyoutofphase · commit 6235ccc930ba · 2022-09-04T16:00:05.000-04:00
diff --git a/src/lib.rs b/src/lib.rs
@@ -42,7 +42,6 @@
   const_mut_refs,
   const_precise_live_drops,
   const_ptr_is_null,
-  const_ptr_offset_from,
   const_ptr_read,
   const_ptr_write,
   // this should be called `const_interior_mutability` IMO
