Split error macro into two versions (format vs non-formating) to allow format checking at compile-time

src/Nazara/Network/Linux/SocketPollerImpl.cpp

@@ -61,7 +61,7 @@ namespace Nz
 
 		if (epoll_ctl(m_handle, EPOLL_CTL_ADD, socket, &entry) != 0)
 		{
-			NazaraError("failed to add socket to epoll structure (errno {0}: {1})", errno, Error::GetLastSystemError());
+			NazaraErrorFmt("failed to add socket to epoll structure (errno {0}: {1})", errno, Error::GetLastSystemError());
 			return false;
 		}