widl: fix handling of [local] functions without [call_as]

[Michael Karcher]

Output NULL pointers into proxy table and STUB_FORWARDING_FUNCTION into
stub tables if a local function has no call_as function associated, just
as MIDL does.
---
 tools/widl/proxy.c |   27 +++++++++++++++++++--------
 1 files changed, 19 insertions(+), 8 deletions(-)
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