Fix Windows build errors: config_parser.h, poll(), localtime()

- Replace sys/socket.h with platform_compat.h in config_parser.h
- Add #include <poll.h> for Windows in platform_compat.h
- Fix localtime() type mismatch: cast tv.tv_sec to time_t
- All 22 tests pass on Linux

src/config_parser.h

@@ -4,9 +4,7 @@
 
 #include <stdint.h>
 #include <stddef.h>
-#include <sys/socket.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
+#include "../lib/platform_compat.h"
 
 #ifdef __cplusplus
 extern "C" {