Added an exception and link to a patch the user should use if they
are using GCC 5 for specific ARM machine.
(From yocto-docs rev: 4f43b683cf4a078c6df4b8c6be59e6fb8702d265)
Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>