sal: use pread / pwrite on every *nix
sal: use pread / pwrite on every *nix

pread / pwrite don't look as a Linux and Solaris privilege.

Change-Id: Ifb2e88445d4064c13a406007bfd523ae0caa38e5

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core