gfile: Limit access to files when copying

file_copy_fallback creates new files with default permissions and
set the correct permissions after the operation is finished. This
might cause that the files can be accessible by more users during
the operation than expected. Use G_FILE_CREATE_PRIVATE for the new
files to limit access to those files.
7 jobs for backport-876-gfile-permissions-glib-2-60 in 10 minutes and 49 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #317703
cross-android_api21_arm64

00:03:24

passed #317704
cross-android_api28_arm64

00:03:21

passed #317705
cross-mingw64

00:01:32

passed #317702
fedora-x86_64

00:07:02

passed #317706
win32
msys2-mingw32

00:08:55

passed #317707
win32
vs2017-x64

00:09:22

 
  Coverage
passed #317708
coverage

00:01:24

77.5%