[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] FilePlugin>>primitiveFileAtEnd for non-regular files (#232)

[CyrilFerlicot]

@akgrant43 
 Hi,

Since this PR was merged OSProcess is broken if I use it with the latest Pharo 61 and the latest VM. 

Here is an example of error:

```
BufferedAsyncFileReadStream(Object)>>primitiveFailed:
BufferedAsyncFileReadStream(Object)>>primitiveFailed
BufferedAsyncFileReadStream(StandardFileStream)>>primAtEnd:
BufferedAsyncFileReadStream(StandardFileStream)>>atEnd
[ self readBuffer atEnd and: [ super atEnd ] ] in BufferedAsyncFileReadStream>>atEnd
[ caught := true.
self wait.
blockValue := mutuallyExcludedBlock value ] in Semaphore>>critical:
BlockClosure>>ensure:
Semaphore>>critical:
BufferedAsyncFileReadStream>>atEnd
BufferedAsyncFileReadStream(AttachableFileStream)>>upToEnd
ExternalPipe>>upToEnd
PipeableOSProcess(PipeJunction)>>upToEnd
[ super upToEnd ] in PipeableOSProcess>>upToEnd
[ caught := true.
self wait.
blockValue := mutuallyExcludedBlock value ] in Semaphore>>critical:
BlockClosure>>ensure:
Semaphore>>critical:
PipeableOSProcess>>upToEnd
PipeableOSProcess(PipeJunction)>>outputOn:
PipeableOSProcess(PipeJunction)>>output
PipeableOSProcess(PipeJunction)>>outputAndError
```

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