Fix two more Windows/MinGW compile errors

- net_platform.hpp: guard ssize_t typedef with !__MINGW32__ since MinGW-w64
  already defines ssize_t as __int64 in corecrt.h
- logger.hpp: push/pop ERROR macro around LogLevel enum (same wingdi.h clash
  as world_packets.hpp)

include/network/net_platform.hpp

@@ -11,7 +11,9 @@
   #pragma comment(lib, "ws2_32.lib")
 
   using socket_t  = SOCKET;
-  using ssize_t   = int;             // recv/send return int on Windows
+#ifndef __MINGW32__
+  using ssize_t   = int;             // recv/send return int on MSVC
+#endif
 
   inline constexpr socket_t INVALID_SOCK = INVALID_SOCKET;