[Toybox] xargs "argument too long"

[enh]

so you'll not like this...

here's the fix for the xargs tests:

diff --git a/toys/posix/xargs.c b/toys/posix/xargs.c
index 9a3e9dae..244bd471 100644
--- a/toys/posix/xargs.c
+++ b/toys/posix/xargs.c
@@ -76,7 +76,7 @@ static char *handle_entries(char *data, char **entry)
       if (!*s) break;
       save = s;

-      TT.bytes += sizeof(char *);
+//      TT.bytes += sizeof(char *);

       for (;;) {
         if (++TT.bytes >= TT.s && TT.s) return save;

as far as i can tell, GNU xargs isn't counting those bytes. that's the
only way i can make sense of the behavior when i add/subtract one from
the -s argument...

~$ echo -ne 'one \ntwo\n three' | strace -f -e execve xargs -s 13 echo
execve("/usr/bin/xargs", ["xargs", "-s", "13", "echo"], 0x7ffc5d513ea0
/* 64 vars */) = 0
strace: Process 238587 attached
[pid 238587] execve("/bin/echo", ["echo", "one", "two"],
0x7fff0dd5a430 /* 64 vars */) = 0
one two
[pid 238587] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=238587,
si_uid=73769, si_status=0, si_utime=0, si_stime=0} ---
strace: Process 238588 attached
[pid 238588] execve("/bin/echo", ["echo", "three"], 0x7fff0dd5a430 /*
64 vars */) = 0
three
[pid 238588] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=238588,
si_uid=73769, si_status=0, si_utime=0, si_stime=0} ---
+++ exited with 0 +++
~$

_seems_ like a GNU bug, but if no-one's cared/noticed all these years?
plus the BSD xargs on macOS behaves the same as the GNU one, so
there's widespread support for not counting the pointers...