This is a new version of the g_file_set_contents() API which will allow
its safety to be controlled by some flags, allowing the user to choose
their preferred tradeoff between safety (`fsync()` calls) and speed.
Currently, the flags do nothing and the new API behaves like the old
API. This will change in the following commits.
Signed-off-by: Philip Withnall <withnall@endlessm.com>
Helps: #1302
554107c23c
