test/lirbd/fsx: fix Windows issues

test/lirbd/fsx: fix Windows issues

There are a few more issues that need to be addressed in order to
run this test on Windows:

* aligned_free (compat.h wrapper) needs to be used after allocating
  memory using posix_memalign, "free" causes a crash on Windows
* long (4B) can't store x64 pointers on Windows, we'll use
  uintptr_t instead.
* use O_BINARY when opening files, otherwise certain characters
  get translated (e.g. LF to CRLF).

Signed-off-by: Lucian Petrut <lpetrut@cloudbasesolutions.com>