Address post-rebase build failures

Rebasing on `main` led to new build failures because more things needed
exporting from the module. This diff addresses those cases.

Author: ispeters

include/stdexec/__detail/__diagnostics.hpp

@@ -95,9 +95,11 @@ namespace STDEXEC
   struct _WITH_COMPLETION_SIGNATURES_
   {};
 
+  STDEXEC_MODULE_EXPORT_AUTHORING
   struct _WITH_FUNCTION_
   {};
 
+  STDEXEC_MODULE_EXPORT_AUTHORING
   struct _WITH_ARGUMENTS_
   {};
 
@@ -116,6 +118,7 @@ namespace STDEXEC
   struct _SENDER_TYPE_IS_NOT_DECAY_COPYABLE_
   {};
 
+  STDEXEC_MODULE_EXPORT_AUTHORING
   struct _PREDECESSOR_RESULTS_ARE_NOT_DECAY_COPYABLE_
   {};
 
@@ -128,6 +131,7 @@ namespace STDEXEC
   struct _INVALID_ARGUMENT_
   {};
 
+  STDEXEC_MODULE_EXPORT_AUTHORING
   struct _FUNCTION_IS_NOT_CALLABLE_WITH_THE_GIVEN_ARGUMENTS_
   {};
 

include/stdexec/__detail/__tuple.hpp

@@ -324,6 +324,7 @@ namespace STDEXEC
   STDEXEC_MODULE_EXPORT_AUTHORING
   using __tup::__tuple;
 
+  STDEXEC_MODULE_EXPORT_AUTHORING
   inline constexpr __tup::__apply_t __apply{};
 
   STDEXEC_MODULE_EXPORT_AUTHORING

include/stdexec/functional.hpp

@@ -441,6 +441,7 @@ namespace STDEXEC
   //!
   //! \returns A `__flipped<__decay_t<_Fn>>` object such that calling it with `(a, b)`
   //! calls `__fn(b, a)`.
+  STDEXEC_MODULE_EXPORT_AUTHORING
   template <class _Fn>
   STDEXEC_ATTRIBUTE(host, device)
   constexpr auto __flip(_Fn &&__fn) noexcept(__nothrow_decay_copyable<_Fn>)