[Piglit] enhance cache life of templates on linux

Dylan Baker baker.dylan.c at gmail.com
Mon Sep 28 18:05:16 PDT 2015

On linux ~/.cache provides a location to store small cached files, like
the generated mako templates used for html generation and for generated
tests which survives reboots.

This provides a small speedup to build time and to html generation.

On non-linux this continues to use the temporary directory to store
these files.

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