New option parsing infrastructure (doesn't use getopt).  Hook it up to
existing applets.  Still a bit buggy, but bits of it work.
diff --git a/main.c b/main.c
index 89977f6..20f4cf4 100644
--- a/main.c
+++ b/main.c
@@ -51,6 +51,7 @@
 	toys.which = which;
 	toys.argv = argv;
 	toys.exitval = 1;
+	if (which->options) get_optflags();
 }
 
 // Run a toy.