shared/options: store argc+argv in the OptionParser state struct

After writing the code to parse options in a bunch of places, I think
passing the argc+argv to various functions to query state is annoying.
It seems nicer to just stash them in the state struct once.

src/bless-boot/bless-boot.c

@@ -75,10 +75,10 @@ static int parse_argv(int argc, char *argv[], char ***ret_args) {
         assert(argc >= 0);
         assert(argv);
 
-        OptionParser state = {};
+        OptionParser state = { argc, argv };
         const char *arg;
 
-        FOREACH_OPTION(&state, c, argc, argv, &arg, /* on_error= */ return c)
+        FOREACH_OPTION(&state, c, &arg, /* on_error= */ return c)
                 switch (c) {
                 OPTION_COMMON_HELP:
                         return help();
@@ -93,7 +93,7 @@ static int parse_argv(int argc, char *argv[], char ***ret_args) {
                         break;
                 }
 
-        *ret_args = option_parser_get_args(&state, argc, argv);
+        *ret_args = option_parser_get_args(&state);
         return 1;
 }