Remove leftover asio headers

Author: tstenner

src/resolve_attempt_udp.cpp

@@ -3,7 +3,6 @@
 #include "resolver_impl.h"
 #include "socket_utils.h"
 #include <boost/asio/ip/multicast.hpp>
-#include <boost/asio/placeholders.hpp>
 #include <sstream>
 
 using namespace lsl;

src/resolver_impl.cpp

@@ -3,7 +3,6 @@
 #include "resolve_attempt_udp.h"
 #include "socket_utils.h"
 #include <boost/asio/ip/udp.hpp>
-#include <boost/asio/placeholders.hpp>
 #include <boost/thread/thread_only.hpp>
 #include <memory>
 

src/tcp_server.cpp

@@ -8,7 +8,6 @@
 #include <boost/asio/io_context.hpp>
 #include <boost/asio/ip/host_name.hpp>
 #include <boost/asio/ip/tcp.hpp>
-#include <boost/asio/placeholders.hpp>
 #include <boost/asio/read_until.hpp>
 #include <boost/asio/write.hpp>
 #include <boost/thread/thread_only.hpp>

src/udp_server.cpp

@@ -4,7 +4,6 @@
 #include <boost/asio/ip/address.hpp>
 #include <boost/asio/ip/multicast.hpp>
 #include <boost/asio/ip/udp.hpp>
-#include <boost/asio/placeholders.hpp>
 #include <boost/thread/thread_only.hpp>
 #include <sstream>