widl: Detect interfaces that inherit from another interface as objects.

[Rob Shearman]

This is in addition to the current rules.
---
 tools/widl/header.c |   12 +++++++-----
 tools/widl/header.h |    2 +-
 tools/widl/parser.y |    4 ++--
 tools/widl/proxy.c  |    4 ++--
 tools/widl/widl.c   |    2 +-
 5 files changed, 13 insertions(+), 11 deletions(-)

Thanks to Maarten Lankhorst for reporting the issue.
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