add includes for linux gcc

Adapter.hxx

@@ -8,6 +8,7 @@
 #include "locked_queue.hh"
 #include <cassert>
 #include "pEpLog.hh"
+#include <atomic>
 
 namespace pEp {
     namespace Adapter {

Semaphore.hh

@@ -6,6 +6,7 @@
 
 #include <mutex>
 #include <condition_variable>
+#include <atomic>
 
 namespace pEp {
     class Semaphore {

pEpLog.cc

@@ -4,8 +4,10 @@
 #include "pEpLog.hh"
 #include <iostream>
 #include <sstream>
+#include <mutex>
 #include <atomic>
 
+
 namespace pEp {
 namespace Adapter {
 namespace pEpLog {