widl: Be more strict about where semicolons can appear in IDL files.

[Robert Shearman]

In particular, don't allow them after cpp_quote and without a statement.

Update the rules for importlib, library definition, dispinterface 
definition, interface definition, coclass definition and module 
definition to optionally allow a semicolon postfix.

Call pop_import from the parser instead of the lexer to ensure that 
pop_import is only called after the last statement in the imported file 
has been parsed.
---
  tools/widl/parser.h |    1 +
  tools/widl/parser.l |    8 ++------
  tools/widl/parser.y |   37 +++++++++++++++++++++++++------------
  3 files changed, 28 insertions(+), 18 deletions(-)
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