widl: Make identifiers file more compatible with midl.

[Jacek Caban]

This is partial fix for Mozilla compilation, which #includes _i.c files
in a C++ file. In that scenario, initguid.h is pulled, causing problems.
MIDL doesn't include initguid.h (although it may use INITGUID if requested).

This is not enough to fix Mozilla, but it's a step forward. For full
fix, we'd need to stop using DEFINE_GUID in generated files, which would
require bigger changes in Wine.

---
 tools/widl/header.c |  2 +-
 tools/widl/header.h |  2 --
 tools/widl/widl.c   | 37 +++++++++++++++++++++++++++++++++----
 3 files changed, 34 insertions(+), 7 deletions(-)


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