[PATCH 0/2] Make gdbserver work with filename-only binaries

[Sergio Durigan Junior]

These two patches fix the issue pointed by Simon on IRC, that
gdbserver doesn't recognize filename-only binaries anymore:

  $ gdbserver :1234 a.out
  /bin/bash: line 0: exec: a.out: not found
  During startup program exited with code 127.
  Exiting

The first one is a preparation patch (and can go in independently),
which moves path-manipulation functions from utils.c to a new
common/pathstuff.c, making them available for gdbserver as well.

The second patch is the fix itself.

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