Patch to reduce usage of tempnam()

[Pavel Machek]

Hi!

> The difference is that mc_mkstemps creates the template for you and even
> adds the directory name (/tmp or $TMPDIR if set). It can be changed to
> call the native mkstemps if it's available.

Patch looks good, except I'm not sure it is good idea to cache
location of /tmp. getenv() should be pretty fast function.

								Pavel
-- 
I'm pavel at ucw.cz. "In my country we have almost anarchy and I don't care."
Panos Katsaloulis describing me w.r.t. patents at discuss at linmodems.org