MSVC6: Fix build issue for variable argument interfaces.

It is reported for MSVC builds:
source\Include\acutils.h(1235) : warning C4096: '__cdecl' must be used with '...'
source\Include\acutils.h(1248) : warning C4096: '__cdecl' must be used with '...'

This can be reproduced when using __fastcall /Gr or __stdcall /Gz
compiler options by default.

This patch fixes this build issue. Lv Zheng.

Signed-off-by: Lv Zheng <lv.zheng@intel.com>
MSVC6: Add support to disable inline deletion warning.

For MSVC6, inline deletion will be warned. This generates giant build
warning report in MSVC6 environment.

This patch is only useful when using __fastcall /Gr or __stdcall /Gz
compiler options by default. Lv Zheng.

Signed-off-by: Lv Zheng <lv.zheng@intel.com>