<functional>: _HAS_STATIC_RTTI=0 shouldn't say typeid(void)

[StephanTLavavej]

We have a supported (obscure) mode _HAS_STATIC_RTTI=0 which disables most occurrences of typeid(Type). However, it says typeid(void) in a couple of places (I believe these are the only occurrences):

STL/stl/inc/functional

Lines 866 to 870 in 8f4c816

	#if _HAS_STATIC_RTTI
	return typeid(_Callable);
	#else // _HAS_STATIC_RTTI
	return typeid(void);
	#endif // _HAS_STATIC_RTTI

STL/stl/inc/functional

Lines 930 to 934 in 8f4c816

	#if _HAS_STATIC_RTTI
	return typeid(_Callable);
	#else // _HAS_STATIC_RTTI
	return typeid(void);
	#endif // _HAS_STATIC_RTTI

When I implemented this in April 2017, my checkin notes said:

We must provide virtuals, so make this one return typeid(void). (This is a single use of static RTTI, but always for the same type. I felt that this was superior to terminating.) typeid(void) is what's used for empty std::functions, so it's a reasonable return value.

It turns out that clang.exe has a mode, -fno-rtti, which makes typeid an error, even typeid(void). I believe we should change _HAS_STATIC_RTTI=0 to never say typeid(void).

[SuperWig]

A bit off topic but wow those double // _HAS_STATIC_RTTI right next to each other is... The opposite of helpful.