BaseTools/LZMA: fix the format issue for last patch

BaseTools/LZMA: fix the format issue for last patch

There are no functional changes in this patch. fixing the format base on
last commit.
The only change is 1) add back the blank line, which can help we better
compare with the original LZMA source code. 2) remove the indent of
#ifndef and #endif.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Yonghong Zhu <yonghong.zhu@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>