[PATCH 1/2]vbscript: Implemented builtin function CInt

[Zhan Jianyu]

(This is a re-submitted patch due to applying failure of the
previous one.)

This patch is built based on Jaceks's newly-submitted patch:

    commit 48a862306288d69d3623d5ecdc0f5a5a40addafe
    ( vbscript: Round half to even in to_int)

Thanks, Jacek. :-)

With his patch, CInt could be implementd in a clean way, without
any introduced helper function.

This patch also add tests for any corner cases, and it has passed testbot's
testing.

---
 dlls/vbscript/global.c      |   14 ++++++++++++--
 dlls/vbscript/tests/api.vbs |   23 +++++++++++++++++++++++
 2 files changed, 35 insertions(+), 2 deletions(-)

--

Regards,
Zhan Jianyu
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