Merge #615

615: lex: accept zero codepoints in strings r=philberty a=dkm

From Mark Wielaard : https://gcc.gnu.org/pipermail/gcc-rust/2021-August/000127.html

> 
> Zero characters (codepoints) are acceptable in strings. The current
> Lexer::parse_string skipped such zero codepoints by accidents. The
> zero codepoint was also used as error/skip indicator, but that is only
> true if the third argument of utf8_escape_pair is true (yes, it is
> called pair, but is a triple).
> 
> Add a testcase that checks the (sub)strings are separated by zero
> chars. Since we cannot slice strings yet this uses extern "C"
> functions, printf and memchr.


Co-authored-by: Mark Wielaard <mark@klomp.org>

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