tests/fcntl.c: fix fcntl test on mips64
tests/fcntl.c: fix fcntl test on mips64

On mips64 the F_GETLK and F_SETLKW64 constants have identical values which
causes the "wrong" constant to be printed by strace.

tests/fcntl.c (test_flock64): Do not test F_SETLKW64 on mips64.

cuviper/strace,Saruta/strace,cuviper/strace,cuviper/strace,Saruta/strace,cuviper/strace,Saruta/strace,cuviper/strace,Saruta/strace,Saruta/strace