Bug#913268: pngcrush should call mk*temp*() instead of writing to pngout.png

[Al Ma]

I am also surprised that a fixed file name is used. Why not calling, in pseudocode, something in the vein of mkstemp(if $TMPDIR exists then $TMPDIR+"/pngoutXXXXXX.png" else "/tmp/pngoutXXXXXX.png") or simply mkstemp("pngoutXXXXXX.png")? It seems to me that mkstemp(…) and its sister functions have more merits than a constant filename.
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