libstdc++: Use deleted functions in C++98 mode

We can use deleted functions in C++98 mode if we use pragmas to disable
the -Wc++11-extensions diagnostics. This works with both GCC and Clang.

In some cases this makes the code more robust in C++98 mode because we
were previously not making types copyable at all (e.g.,
_Reuse_or_alloc_node in bits/stl_tree.h) and just relying on testing in
C++11 and later to know we didn't use those functions. In other cases it
gives better diagnostics because we were defining copy constructors and
assignment operators as private

libstdc++-v3/ChangeLog:

	* config/io/basic_file_stdio.h (__basic_file): Define copy
	constructor and copy assignment operator as deleted for C++98.
	* include/bits/stl_bvector.h (vector<bool, A>::data): Define as
	deleted for C++98.
	* include/bits/stl_tree.h (_Reuse_or_alloc_node): Define copy
	constructor as deleted for C++98.
	* include/bits/stl_vector.h (_Asan<allocator<T>>::_Reinit):
	Define copy constructor and copy assignment operator as deleted
	for C++98.
	(_Asan<allocator<T>>::_Grow): Likewise.
	* testsuite/util/replacement_memory_operators.h
	(__gnu_test::counter::scope): Likewise.
	* testsuite/util/testsuite_iterators.h (operator,, operator&)
	(operator+=, operator-=, operator[]): Define deleted operators
	for C++98.

Reviewed-by: Tomasz Kamiński <tkaminsk@redhat.com>