[GiNaC-list] Patch: Replace mktemp with mkstemp

[Till Hofmann]

Hi all,

while building 1.7.1 I noticed that mktemp is still used. I've attached
a patch that replaces mktemp with mkstemp. Note that the behavior is
slightly different: The file is opened twice because mkstemp directly
opens the file, too. I'm not aware of any other solution to safely
create an ofstream for a tmp file. If there is, please let me know.

Kind regards,
Till
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