Make it build on MACOSX

Still need to explicitly defined
-DCMAKE_CXX_FLAGS=--std=c++14
which that flags should goes into CMakefile.txt

JF: Fixed merge failure by removing Filesystem.cpp
    and updated the copyright headers to new standard

Change-Id: I6d0886bd86bc1ddb593028194852551d43c77745
Signed-off-by: Keith Mok <ek9852@gmail.com>
Signed-off-by: Jim Flynn <jim.flynn@arm.com>
diff --git a/src/armnnUtils/Processes.cpp b/src/armnnUtils/Processes.cpp
index 86593aa..41b035b 100644
--- a/src/armnnUtils/Processes.cpp
+++ b/src/armnnUtils/Processes.cpp
@@ -1,11 +1,11 @@
 //
-// Copyright © 2020 Arm Ltd. All rights reserved.
+// Copyright © 2020 Arm Ltd and Contributors. All rights reserved.
 // SPDX-License-Identifier: MIT
 //
 
 #include "Processes.hpp"
 
-#if defined(__unix__)
+#if defined(__unix__) || defined(__APPLE__)
 #include <unistd.h>
 #elif defined(_MSC_VER)
 #include "WindowsWrapper.hpp"
@@ -18,7 +18,7 @@
 
 int GetCurrentId()
 {
-#if defined(__unix__)
+#if defined(__unix__) || defined(__APPLE__)
     return getpid();
 #elif defined(_MSC_VER)
     return ::GetCurrentProcessId();