syscalls/fcntl34: Use flock64 instead of flock

This test uses OFD locks which are supported only by 64-bit ABI.
Thus OFD locks must be used with flock64 structure for sure in this
test. It is necessary because on some 32-bit targets (e.g. 32-bit
uClibc) flock is not mapped to flock64 when _FILE_OFFSET_BITS is not
set to 64.

Signed-off-by: Yuriy Kolerov <yuriy.kolerov@synopsys.com>
Signed-off-by: Cyril Hrubis <chrubis@suse.cz>

testcases/kernel/syscalls/fcntl/fcntl34.c

@@ -67,7 +67,7 @@ void *thread_fn_01(void *arg)
 
 	memset(buf, (intptr_t)arg, write_size);
 
-	struct flock lck = {
+	struct flock64 lck = {
 		.l_whence = SEEK_SET,
 		.l_start  = 0,
 		.l_len    = 1,