eina: avoid wrong implicit conversion from unsigned to unsigned long in Eina_Value...

eina: avoid wrong implicit conversion from unsigned to unsigned long in Eina_Value tests

There is no automatic promotion of unsigned to unsigned long when using va_arg,
which means it is illegal to pass an 'unsigned' value and then use it as an
unsigned long in eina_arg_vset. Doing so yields incorrect results on some
architectures like itanium

Patch by  Albin 'Lutin' Tonnerre <albin.tonnerre@gmail.com>

git-svn-id: http://svn.enlightenment.org/svn/e/trunk/eina@71196 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33