BaseTools: Parse decimal format INF_VERSION incorrect

BaseTools: Parse decimal format INF_VERSION incorrect

hex number 0x00010019, the major number is 0001, the
minor number is 0019.
the decimal number 1.25, the major number is 1, and the
minor number is 25

Fix https://bugzilla.tianocore.org/show_bug.cgi?id=921

Cc: Liming Gao <liming.gao@intel.com>
Cc: Yonghong Zhu <yonghong.zhu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Yunhua Feng <yunhuax.feng@intel.com>
Reviewed-by: Yonghong Zhu <yonghong.zhu@intel.com>