Log Message:
Changes 4.48:
- From Windows version of 7-zip 4.48:
  - Encryption strength for .7z format was increased.
    Now it uses random initialization vectors.
  - Some bugs were fixed.
- fixed 1729236: Makefile infrastructure not safe for parallel compilation
  (if your make command understands -C and -j4, copy makefile.parallel_jobs over \ 
makefile)
- Now the executables are not built with the PIC (position-independent code) flag.
  7z.so are still built with the PIC flag.
  7za and 7zr are now faster than 7z with 7z.so.
  7za, 7zr and 7r are now smaller.
- contrib/gzip-like_CLI_wrapper_for_7z/p7zip now supports spaces in filename
  and use 7za instead of 7z.
- contrib/qnx630sp3 added to support QNX built