widl: Remove some confusion in how version numbers are packed into an attribute by defining some macros for this purpose.

[Robert Shearman]

Remove unneeded includes.
---
  tools/widl/client.c  |    8 ++------
  tools/widl/header.c  |    9 ++++-----
  tools/widl/parser.y  |    6 ++----
  tools/widl/server.c  |   13 +++++--------
  tools/widl/typegen.c |    1 -
  tools/widl/utils.h   |    4 ++++
  6 files changed, 17 insertions(+), 24 deletions(-)
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