fileutils: improve Windows hard link file handling

Fix file access issues when reading hard links on Windows by:
- Adding explicit share mode (_SH_DENYNO) to allow reading files opened
  elsewhere
- Using binary mode to ensure consistent behavior with hard links

This resolves issues with reading hard linked files on Windows while
maintaining behavior on other platforms.

jami-client-qt#1899
Change-Id: I2adc0f29db46d5bf5b69762018e7a5e677ec3d04