bazel: extend oss-fuzz set up.
bazel: extend oss-fuzz set up.

Split CFLAGS and CXXFLAGS into language-specific bazel constructs. This
is needed to make Tensorflow work.

Related: https://github.com/google/oss-fuzz/pull/8992

Signed-off-by: David Korczynski <aa743a0aaec8f7d7a1f01442503957f4d7a2d634@adalogics.com>

google/fuzztest,google/fuzztest