Intel Fortran compiler errors out on unifycr file descriptors

Nobody has claimed this yet.

With the Intel Fortran compiler, I get the following:

```
+ test_write
forrtl: Bad file descriptor
forrtl: severe (108): cannot stat file, unit 0, file /unifycr/file.ckpt
Image PC Routine Line Source
test_write 000000000040B0CE for__io_return Unknown Unknown
test_write 000000000041A0C5 for_open Unknown Unknown
test_write 0000000000408A51 Unknown Unknown Unknown
test_write 000000000040866E Unknown Unknown Unknown
libc-2.17.so 00002AAAAC09D3D5 __libc_start_main Unknown Unknown
test_write 0000000000408569 Unknown Unknown Unknown
```

I was able to see that this was in fact running through the UnifyCR I/O wrappers. The for_open was eventually calling into the open64 wrapper. It's possible that the Intel Fortran I/O library may not like the out-of-range file descriptor the wrapper is returning.

### System information

Type | Version/Name
--- | ---
Operating System |
OS Version |
Architecture |
UnifyCR Version |

### Describe the problem you're observing

### Describe how to reproduce the problem

### Include any warning or errors or releveant debugging data

Start at the UnifyFS open64 wrapper reached from Intel Fortran's for_open and reproduce the reported Bad file descriptor error with the available test_write case. Compare the descriptor returned by the wrapper with Intel Fortran's expectations; done means the Fortran file open succeeds without the reported error.

Written by the indexing model from the issue text.