Remove unused rwlock.hpp header and includes

rwlock.hpp was left over after migrating to atomic shared pointers
for branches configuration. No code references ReadGuard/WriteGuard
any longer, so drop the header and its stale includes.

src/config.hpp

@@ -47,7 +47,6 @@
 #include "fuse_cfg.hpp"
 #include "fuse_readdir.hpp"
 #include "policy.hpp"
-#include "rwlock.hpp"
 #include "tofrom_ref.hpp"
 #include "tofrom_wrapper.hpp"
 #include "syslog.hpp"

src/policy_epff.cpp

@@ -26,7 +26,6 @@
 #include "fs_statvfs_cache.hpp"
 #include "policy.hpp"
 #include "policy_error.hpp"
-#include "rwlock.hpp"
 
 #include <string>
 #include <vector>

src/policy_eplus.cpp

@@ -25,7 +25,6 @@
 #include "fs_statvfs_cache.hpp"
 #include "policy.hpp"
 #include "policy_error.hpp"
-#include "rwlock.hpp"
 
 #include <limits>
 #include <string>

src/policy_eppfrd.cpp

@@ -26,7 +26,6 @@
 #include "policy.hpp"
 #include "policy_error.hpp"
 #include "rnd.hpp"
-#include "rwlock.hpp"
 #include "strvec.hpp"
 
 #include <string>

src/policy_lup.cpp

@@ -26,7 +26,6 @@
 #include "fs_statvfs_cache.hpp"
 #include "policy.hpp"
 #include "policy_error.hpp"
-#include "rwlock.hpp"
 
 #include "base_types.h"
 

src/policy_newest.cpp

@@ -25,7 +25,6 @@
 #include "fs_statvfs_cache.hpp"
 #include "policy.hpp"
 #include "policy_error.hpp"
-#include "rwlock.hpp"
 
 #include <string>
 #include <limits>

src/rwlock.hpp

@@ -1,66 +0,0 @@
-/*
-  ISC License
-
-  Copyright (c) 2026, Antonio SJ Musumeci <trapexit@spawn.link>
-
-  Permission to use, copy, modify, and/or distribute this software for any
-  purpose with or without fee is hereby granted, provided that the above
-  copyright notice and this permission notice appear in all copies.
-
-  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-*/
-
-#pragma once
-
-#include <pthread.h>
-
-namespace rwlock
-{
-  class ReadGuard
-  {
-  public:
-    ReadGuard(pthread_rwlock_t &lock_)
-      : _lock(lock_)
-    {
-      pthread_rwlock_rdlock(&_lock);
-    }
-
-    ~ReadGuard()
-    {
-      pthread_rwlock_unlock(&_lock);
-    }
-
-  private:
-    ReadGuard();
-
-  private:
-    pthread_rwlock_t &_lock;
-  };
-
-  class WriteGuard
-  {
-  public:
-    WriteGuard(pthread_rwlock_t &lock_)
-      : _lock(lock_)
-    {
-      pthread_rwlock_wrlock(&_lock);
-    }
-
-    ~WriteGuard()
-    {
-      pthread_rwlock_unlock(&_lock);
-    }
-
-  private:
-    WriteGuard();
-
-  private:
-    pthread_rwlock_t &_lock;
-  };
-}