exynos5: Fix build with gcc 4.8

log.h uses constructs that gcc 4.8 warns about because they
can be interpreted as C++11 string literals.
Since it is built with -Werror, this causes the build to fail.

Change-Id: I63121247efb7d42377fdd7606cdb5b5a67b9b232
Signed-off-by: Bernhard Rosenkränzer <Bernhard.Rosenkranzer@linaro.org>
Fix strict narrowing violations by static casting
openmax: build with gcc for now