Do not assume CLANG is used when custom toolchain is provided

When overriding toolchain with LOCAL_CC, LOCAL_CXX
build system shall not assume that this custom toolchain
is CLANG.

Bug: 29635686
Change-Id: I9712d098216740c4ff20bd2a4749f489af85b50e
Signed-off-by: Alexey Polyudov <apolyudov@google.com>
1 file changed