psppire: Fix insecure temporary file creation in clipboard_get_cb().
[pspp] / lib /
drwxr-xr-x   ..
-rw-r--r-- 21 .gitignore
-rw-r--r-- 1279 OChangeLog
-rw-r--r-- 221 automake.mk
drwxr-xr-x - gtk-contrib
drwxr-xr-x - linreg