[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] Fix image opening on unix (#529)

[smalltalking]

In imgInit() of sqUnixMain.c
- preserve fd instead of throwing it away
- use fileno() to get the file descriptor (fd) created by fopen() instead of
  opening the file again with open() (which leaked a file descriptor due to
  lack of close())
- pass the file descriptor fd instead of the FILE* f to the recently changed
  methods expecting a file descriptor, e.g. readImageFromFileHeapSizeStartingAt()
You can view, comment on, or merge this pull request online at:

  https://github.com/OpenSmalltalk/opensmalltalk-vm/pull/529

-- Commit Summary --

  * Fix image opening on unix

-- File Changes --

    M platforms/unix/vm/sqUnixMain.c (12)

-- Patch Links --

https://github.com/OpenSmalltalk/opensmalltalk-vm/pull/529.patch
https://github.com/OpenSmalltalk/opensmalltalk-vm/pull/529.diff

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