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Fix execv on osx.

    There were a few typos.

--- a/libstd/sys-osx.myr

+++ b/libstd/sys-osx.myr

@@ -544,15 +544,16 @@

 }

 const execv	= {cmd, args

-	var cargs, i

+	var p, cargs, i

 	/* doesn't just call execve() for efficiency's sake. */

-	cargs = (alloca(sizeof(byte#)*(args.len + 1)) castto(byte##))[:args.len]

+	p = alloca((args.len + 1)*sizeof(byte#))

+	cargs = (p castto(byte##))[:args.len]

 	for i = 0; i < args.len; i++

 		cargs[i] = cstring(args[i])

 	;;

 	cargs[args.len] = 0 castto(byte#)

-	-> syscall(Sysexecve, cmd castto(byte#), cargs, __cenvp)

+	-> syscall(Sysexecve, cstring(cmd), p, __cenvp)

 }

 const execve	= {cmd, args, env