system/fd_util: remove unused function close_socket()

src/system/fd_util.c

@@ -78,6 +78,8 @@ fd_set_cloexec(int fd, bool enable)
 #endif
 }
 
+#ifndef WIN32
+
 /**
  * Enables non-blocking mode for the specified file descriptor.  On
  * WIN32, this function only works for sockets.
@@ -101,6 +103,8 @@ fd_set_nonblock(int fd)
 #endif
 }
 
+#endif
+
 int
 pipe_cloexec_nonblock(int fd[2])
 {
@@ -127,13 +131,3 @@ pipe_cloexec_nonblock(int fd[2])
 	return ret;
 #endif
 }
-
-int
-close_socket(int fd)
-{
-#ifdef WIN32
-	return closesocket(fd);
-#else
-	return close(fd);
-#endif
-}

src/system/fd_util.h

@@ -64,12 +64,6 @@ fd_set_cloexec(int fd, bool enable);
 int
 pipe_cloexec_nonblock(int fd[2]);
 
-/**
- * Portable wrapper for close(); use closesocket() on WIN32/WinSock.
- */
-int
-close_socket(int fd);
-
 #ifdef __cplusplus
 } /* extern "C" */
 #endif