MDEV-11520 post-fix: Retry posix_fallocate() on EINTR in fil_ibd_create()

Earlier versions of MariaDB only use posix_fallocate() when extending
data files, not when initially creating the files,

storage/innobase/fil/fil0fil.cc

@@ -3863,7 +3863,10 @@ fil_ibd_create(
 	  FusionIO HW/Firmware but should also be the prefered way to extend
 	  a file.
 	*/
-        int	ret = posix_fallocate(file, 0, size * UNIV_PAGE_SIZE);
+	int	ret;
+	do {
+		ret = posix_fallocate(file, 0, size * UNIV_PAGE_SIZE);
+	} while (ret != 0 && ret != EINTR);
 
 	if (ret == 0) {
 		success = true;