when dumping embedded images, don't crash when the filesystem of the current directory is read-only for the given user
when dumping embedded images, don't crash when the filesystem of the current directory is read-only for the given user

Distrotech/libpwd,cpjreynolds/libwpd,Distrotech/librevenge,Distrotech/libpwd,Distrotech/libpwd,cpjreynolds/libwpd,Distrotech/librevenge,cpjreynolds/libwpd,Distrotech/librevenge,Distrotech/libpwd,Distrotech/librevenge,Distrotech/librevenge