frameworks/native: Fix build with ISO C++11 compilers

Fix macro definitions so they can't be confused with C++11 string
literals

Change-Id: I2856933291d08eed789188ea9be036324384e67f
Signed-off-by: Bernhard Rosenkraenzer <Bernhard.Rosenkranzer@linaro.org>
Don't crash on missing functions in hwcomposers

https://android-review.googlesource.com/#/c/46763/