https://bugzilla.tianocore.org/show_bug.cgi?id=417
The commit makes the following refinements in GenVtf source codes to
avoid VS2010/VS2012 build failure:
1. Refines coding style to declare local variables at the beginning of a
code block in function 'main'.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
Reviewed-by: Yonghong Zhu <yonghong.zhu@intel.com>