kernel: re-implement sending handles via port messages

kernel/arg.c

@@ -1,6 +1,7 @@
 #include <kernel/arg.h>
-#include <kernel/libc/string.h>
 #include <kernel/libc/ctype.h>
+#include <kernel/libc/string.h>
+#include <mango/status.h>
 
 static char g_cmdline[CMDLINE_MAX + 1] = {0};
 
@@ -81,7 +82,6 @@ static char *advance_to_next_arg(char *s, char *max)
 	return s;
 }
 
-
 const char *arg_value(const char *arg_name)
 {
 	char *s = g_cmdline;