Do not consider the Evas_Vg API as BETA anymore
Summary:
It has been widely used for quite some time now.
Fixes T6889
Test Plan:
Manually built the evas-vg-simple.c and evas-vg-batman.c examples after
removing the manual define of EFL_BETA_API_SUPPORT and EFL_EO_API_SUPPORT
that they have at the top.
Reviewers: ajwillia.ms, zmike
Reviewed By: zmike
Subscribers: cedric, #committers
Tags: #efl
Maniphest Tasks: T6889
Differential Revision: https://phab.enlightenment.org/D6230
Change-Id: I6ade2d86773f14a6a48ccee7e9d3f9d3a3e6eba3