evas/cserve2: The slave should measure the time spent

evas/cserve2: The slave should measure the time spent
 loading glyphs.
Instead of measuring the time spent by the server between asking and
receiving the glyphs rendered, we measure now the time spent by the
slave to load the glyph, and then to render it, and then we report this
time to the server.

git-svn-id: svn+ssh://svn.enlightenment.org/var/svn/e/trunk/evas@73373 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33