Remove LOCAL_CLANG and clang: true

clang is the default compiler since Android nougat

Test: mma & verified it´s still build with clang
Change-Id: Ie41a98a7d72940e8169996a7081ccec9b94aa61c
Signed-off-by: Lennart Wieboldt <lennart.1997@gmx.de>
12 files changed