[PATCH 2/3]vbscript: Implemented builtin function CInt

[larmbr zhan]

This patch implement the builtin function CInt,  and add some test cases.

>From the test result on Windows, the rounding algorithm used inside
CInt is Banker's
Rounding , so add a helper function to_int_banker_rounding.

---
 dlls/vbscript/global.c      |   43 +++++++++++++++++++++++++++++++++++++++++--
 dlls/vbscript/tests/api.vbs |   18 ++++++++++++++++++
 2 files changed, 59 insertions(+), 2 deletions(-)
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