posix_fadvice is not available on kFreeBSD.

Forwarded: David Robillard <d@drobilla.net>

Gbp-Pq: Name 0001-kfreebsd_ftbfs.patch

src/serd_internal.h

@@ -62,7 +62,9 @@ serd_fopen(const char* path, const char* mode)
 		return NULL;
 	}
 #if defined(HAVE_POSIX_FADVISE) && defined(HAVE_FILENO)
+#ifndef __FreeBSD_kernel__
 	posix_fadvise(fileno(fd), 0, 0, POSIX_FADV_SEQUENTIAL);
+#endif /*__FreeBSD_kernel__*/
 #endif
 	return fd;
 }