Updates to Filesystem.cpp/hpp and NetworkSockets.cpp/hpp to fix failing master

Signed-off-by: David Monahan <david.monahan@arm.com>
Change-Id: I566c29754aa586167a938d2c2b4e5069a39b5e50
diff --git a/src/armnnUtils/Filesystem.hpp b/src/armnnUtils/Filesystem.hpp
index d6dc5b9..2fe720d 100644
--- a/src/armnnUtils/Filesystem.hpp
+++ b/src/armnnUtils/Filesystem.hpp
@@ -10,7 +10,7 @@
 namespace Filesystem
 {
 
-long GetFileSize(const char* path);
+long long GetFileSize(const char* path);
 
 bool Remove(const char* path);