[PATCH v3 4/5] app/test: use rte macro instead of GCC attribute

[Morten Brørup]

> From: Tyler Retzlaff [mailto:roretzla at linux.microsoft.com]
> Sent: Wednesday, 6 March 2024 23.15
> 
> Use newly added __rte_pure macro from rte_common.h instead of
> directly using __attribute__((pure)).
> 
> Signed-off-by: Tyler Retzlaff <roretzla at linux.microsoft.com>
> ---

Reviewed-by: Morten Brørup <mb at smartsharesystems.com>