Eina: Remove eina_prime_table
This has been present since ancient times and no current uses have been detected.
It's an array containing SOME prime numbers without a terminator, so the caller
needs to know the array length in advance.
This does not look very useful (or usable) and therefore it has been decided in
public IRC session to send this thing to hell.
Witnesses: raster stefan_schmidt bu5hm4n