[Libvir] [for discussion only] virDomainBlockPeek preliminary implementation (version 2)

[Richard W.M. Jones]

Jim Meyering's been sending me private emails all afternoon about this 
and that wrong in this patch, so here's an update :-)

It fixes:

  - unnecessary initialisations removed
  - changed the dumb for(;;) putchar into an fwrite call
  - cure multiple memory leaks in virsh
  - fixed const-correctness of the callback function
  - use a wrapper around strtoll
  - replaced some !strcmp with STREQ (etc)
  - use AC_SYS_LARGEFILE to get portable support for 64-bit file offsets

Rich.

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