server: Add a call for retrieving the image file name of a process.

[Robert Shearman]

Use this to implement NtQueryInformationProcess(ProcessImageFileName).
---
  dlls/ntdll/process.c    |   20 +++++++++++++++++++-
  dlls/ntdll/tests/info.c |   36 ++++++++++++++++++++++++++++++++++++
  server/process.c        |   31 +++++++++++++++++++++++++++++++
  server/protocol.def     |    7 +++++++
  4 files changed, 93 insertions(+), 1 deletions(-)
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