C++11 `std::string_view` mis-detected as C++03

[eschnett]

This logic in BinaryBuilder.jl

BinaryBuilder.jl/src/auditor/compiler_abi.jl

Lines 221 to 226 in 44cfc61

	# Otherwise, if we still have `std::string`'s or `std::list`'s in there, it's implicitly a
	# `cxx03` binary, even though we don't have a __cxx03 namespace or something. Mark it.
	if any(occursin("std::string", c) || occursin("std::basic_string", c) ||
	occursin("std::list", c) for c in symbol_names)
	return "cxx03"
	end

triggers on C++11 std::string_view: While std::string maps to std::__cxx11::string internally, std::string_view maps to std::basic_string_view, and the regex matches. This leads to false positives.