Log Message:
Changes 4.51:
- From Windows version of 7-zip 4.50 :
   - Bug was fixed: 7-Zip 4.50 beta could not open some .7z archives.
- fix built of test_emul

Changes 4.50:
- From Windows version of 7-zip 4.50 :
  - New switch for command line version:
  -ssc[-] enables/disables case-sensitive mode for file names.
  - Speed optimizations for AES encryption.
  - Some bugs were fixed.
- contrib/gzip-like_CLI_wrapper_for_7z/p7zip now supports commands like :