Fix Linux i386 build
- missing definitions were causing different definitions of type 'off_t', resulting in linker errors
- fix is to define _LARGEFILE_SOURCE and _FILE_OFFSET_BITS=64



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@176595 91177308-0d34-0410-b5e6-96231b3b80d8