bunpen: lift main up to the toplevel

it seems modules *do* support freestanding hare files at the toplevel -- but only if theres just one of them (?)

pkgs/additional/bunpen/Makefile

@@ -1,7 +1,7 @@
 all: bunpen
 
 bunpen:
-	hare build -o $@ main/
+	hare build -o $@
 
 install:
 	mkdir -p $(PREFIX)/bin

pkgs/additional/bunpen/main.ha

@@ -1,5 +1,6 @@
 // vim: set shiftwidth=2 :
 use log;
+use methods;
 use rtext;
 use strings;
 use os;
@@ -18,6 +19,6 @@ export fn main() void = {
   let my_name = os::args[0];
   let exec_line = os::args[1..];
   rtext::no_new_privs();
-  landlock_restrict();
+  methods::landlock_restrict();
   do_exec(exec_line);
 };

pkgs/additional/bunpen/methods/landlock.ha

@@ -27,7 +27,7 @@ fn access_fs_roughly_write() u64 = return
 
 fn access_fs_roughly_rw() u64 = return access_fs_roughly_read() | access_fs_roughly_write();
 
-fn landlock_restrict() void = {
+export fn landlock_restrict() void = {
   let abi = rtext::landlock_create_ruleset(null, rtext::LANDLOCK_CREATE_RULESET_VERSION)!;
   log::printfln("found landlock version {}", abi);