gl: creating a cairo_surface from Evas_GL_Surface with content_synced = FALSE

When creating cairo_gl_surface from an Evas_GL_Surface, we must set
content_synced = FALSE so that when rendering to the surface, cairo
wil first copy the image in the texture_id to the MSAA renderbuffer.
This works for OpenGL, OpenGLESv3 and OpenGLES w/
GL_ANGLE_framebuffer_blit extension.