variant,tuple: fix/silence misc warnings

msvc:
https://learn.microsoft.com/en-us/cpp/error-messages/compiler-warnings/c5267
Similar to neighboring C4625

Fix for warnings (errors in /WX mode) like
.../variant.h(759): warning C5267: definition of implicit copy constructor for '...' is deprecated because it has a user-provided destructor
(ditto for tuple).

Also fix for -Wunused-parameter in variant.h (`visit_throw_bad_variant_access`)

Author: Vladimir 'virtul' Ivannikov

include/EASTL/tuple.h

@@ -16,6 +16,8 @@
 EA_DISABLE_VC_WARNING(4623) // warning C4623: default constructor was implicitly defined as deleted
 EA_DISABLE_VC_WARNING(4625) // warning C4625: copy constructor was implicitly defined as deleted
 EA_DISABLE_VC_WARNING(4510) // warning C4510: default constructor could not be generated
+EA_DISABLE_VC_WARNING(5267) // warning C5267: definition of implicit copy constructor for '...' is deprecated because it has a user-provided assignment operator
+
 
 #if EASTL_TUPLE_ENABLED
 
@@ -991,4 +993,5 @@ EA_CONSTEXPR decltype(auto) apply(F&& f, Tuple&& t)
 EA_RESTORE_VC_WARNING()
 EA_RESTORE_VC_WARNING()
 EA_RESTORE_VC_WARNING()
+EA_RESTORE_VC_WARNING()
 #endif  // EASTL_TUPLE_H

include/EASTL/variant.h

@@ -81,7 +81,7 @@
 	static_assert(false, "eastl::variant requires a C++14 compatible compiler (at least) ");
 #endif
 
-EA_DISABLE_VC_WARNING(4625) // copy constructor was implicitly defined as deleted
+EA_DISABLE_VC_WARNING(4625 5267) // copy constructor was implicitly defined as deleted
 
 namespace eastl
 {
@@ -1336,9 +1336,8 @@ namespace eastl
 	//     variant<int, long, string> v = "Hello, Variant";
 	//     visit(MyVisitor{}, v);  // calls MyVisitor::operator()(string) {}
 	//
-	EA_DISABLE_VC_WARNING(4100) // warning C4100: 't': unreferenced formal parameter
 	template <typename... Variants>
-	static EA_CPP14_CONSTEXPR void visit_throw_bad_variant_access(Variants&&... variants)
+	static EA_CPP14_CONSTEXPR void visit_throw_bad_variant_access(EA_MAYBE_UNUSED Variants&&... variants)
 	{
 	#if EASTL_EXCEPTIONS_ENABLED
 		using bool_array_type = bool[];
@@ -1352,7 +1351,6 @@ namespace eastl
 		}
 	#endif
 	}
-	EA_RESTORE_VC_WARNING()
 
 	template <typename... Variants>
 	static EA_CONSTEXPR void visit_static_assert_check(Variants&&...)