ANDROID: build: cuttlefish: Upgrade clang to newer version.

The last upgrade introduced a new build failure, because it had a bug
which caused it to emit PLT relocations, certain types of which cannot
be handled by the reloc tool in the kernel.

See https://bugs.llvm.org/show_bug.cgi?id=36674

 for more details.

Bug: 63889157
Change-Id: I813febdbacb0579abcb12dc7f2164cce1e2f5a26
Signed-off-by: Alistair Strachan <astrachan@google.com>