widl: Add support for character constants in expressions.

[Rob Shearman]

---
 tools/widl/expr.c      |   28 +++++++++++++++++++++++++++-
 tools/widl/parser.l    |   14 +++++++++++---
 tools/widl/parser.y    |    3 ++-
 tools/widl/widltypes.h |    1 +
 4 files changed, 41 insertions(+), 5 deletions(-)
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