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libthread: simplify threadsetname()

- open /proc/n/args with OCEXEC flag
- reduce stack usage by using smaller buffer for path
- format pid as ulong

--- a/sys/src/libthread/id.c

+++ b/sys/src/libthread/id.c

@@ -59,7 +59,7 @@

 threadsetname(char *fmt, ...)

 {

 	int fd;

-	char buf[128];

+	char buf[32];

 	va_list arg;

 	Proc *p;

 	Thread *t;

@@ -72,8 +72,8 @@

 	t->cmdname = vsmprint(fmt, arg);

 	va_end(arg);

 	if(t->cmdname && p->nthreads == 1){

-		snprint(buf, sizeof buf, "#p/%lud/args", _tos->pid); //getpid());

-		if((fd = open(buf, OWRITE)) >= 0){

+		snprint(buf, sizeof buf, "/proc/%lud/args", (ulong)getpid());

+		if((fd = open(buf, OWRITE|OCEXEC)) >= 0){

 			write(fd, t->cmdname, strlen(t->cmdname)+1);

 			close(fd);

 		}