[libc++] Consistently replace `::new(__p) T` with `::new ((void*)__p) T`. NFCI.

Everywhere, normalize the whitespace to `::new (EXPR) T`.
Everywhere, normalize the spelling of the cast to `(void*)EXPR`.

Without the cast to `(void*)`, the expression triggers ADL on GCC.
(I think this is a GCC bug: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98249)
Even if it doesn't trigger ADL, it still seems incorrect to use any argument
that's not exactly `(void*)` because that opens the possibility of overload
resolution picking a user-defined overload of `operator new`, which would be
wrong.

Differential Revision: https://reviews.llvm.org/D93153

GitOrigin-RevId: be4c657b010c3fd850ca5cfcee0f96b464740523
diff --git a/include/optional b/include/optional
index 570fa11..97a0bbe 100644
--- a/include/optional
+++ b/include/optional
@@ -321,7 +321,7 @@
     void __construct(_Args&&... __args)
     {
         _LIBCPP_ASSERT(!has_value(), "__construct called for engaged __optional_storage");
-        ::new((void*)_VSTD::addressof(this->__val_)) value_type(_VSTD::forward<_Args>(__args)...);
+        ::new ((void*)_VSTD::addressof(this->__val_)) value_type(_VSTD::forward<_Args>(__args)...);
         this->__engaged_ = true;
     }