[PATCH] scripts/trylink: use portable invocation of mktemp

[Brad Kemp]

> On Jul 10, 2016, at 8:33 PM, Andrew Oates <andrew at andrewoates.com> wrote:
> 
> --tmpdir unfortunately doesn't work on OS X/BSD-style mktemp, but '-t' does.  So "mktemp -t tmp.XXXXXXXXXX" obeys TMPDIR on both Linux and OS X.  "-t" is marked as deprecated in the Linux version's manpage, however --- not sure if you consider that a problem.
> 
> Alternatively, it could just run "mktemp tmp.XXXXXXXXXX", which creates the temporary file in the current directory on both systems.  Not ideal, but consistent (and maybe that's fine given how the script is used in the build system?)
> 
The local directory may not be writeable
Brad

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