Respect the mixing EOL when review patch with TortoiseGitMerge

The steps:
1. Set AutoCrlf to false
2. Invoke "Apply Patches" dialog
3. Add that patch with mixing CRLF(line 1) and LF(line 2)
4. Right click on that patch in list
5. Click "Review Patch with TortoiseGitMerge
6. The EOL of Line 2 is CRLF (should be LF)

Signed-off-by: Yue Lin Ho <b8732003@student.nsysu.edu.tw>