Compress system.7z without Delta method

Compress system.7z without Delta method

- p7zip compresses file with some kinds of methods
  including Delta method
- However, extracting the file compressed by Delta method
  is failed because the version of libtota's lzma-sdk is
  too old(9.20)
- With "-mf=off" option, we can compress with only LZMA method
  which old lzma-sdk supports

- NOTICE
  - Compression ratio is slightly decreased
  - If you want to use Delta method, please update lzma-sdk
    to 15.05 or higher and port libtota

Change-Id: Ib33eec082b7b15c10f3127c8d0c4d558b8c5aa1d
Signed-off-by: Kichan Kwon <k_c.kwon@samsung.com>