cc/gcc: add preliminray support for 4.8

This means:
- introduce the new symbols for 4.8
- do not always select PPL if graphite is selected

Reported-by: "Plotnikov Dmitry" <leitz@ispras.ru>
[Dmitry did a preliminray patch to add gcc-4.8 support,
which this patch is inspired from]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

 reporter_name="Benoît Thébaudeau"

 reporter_url="http://www.advansee.com/"

 reporter_comment="Cortex-A9 with NEON support using the hard-float GNU EABI."