fuzzshark: integrate oss-fuzz targets in CMake

The current fuzzshark target built by CMake is not usable for fuzzing.
Address this by adding a new ENABLE_FUZZER option that enables mandatory
instrumentation and libFuzzer linking options for the fuzzshark binary.

Create more CMake targets for specific fuzzing targets such as
fuzzshark_ip and fuzzshark_ip_proto-udp. These targets are not built by
default, either build individual targets or use the all-fuzzers target.

Now these binaries are not specific to oss-fuzz, so move them to a new
directory (perhaps the corpora can be added here in the future).
oss-fuzz build.sh is simplified and reuses the CMake targets.

When OSS_FUZZ is set, it will force static linking with external
libraries and limit parallel linker jobs (maybe not necessary for
Google's oss-fuzz builders, but my 8G/6c VM ran out of memory).

Change-Id: If3ba8f60ea1f5c3bd2131223050a81f9acbce05d
Reviewed-on: https://code.wireshark.org/review/30228
Petri-Dish: Peter Wu <peter@lekensteyn.nl>
Tested-by: Petri Dish Buildbot
Reviewed-by: Anders Broman <a.broman58@gmail.com>

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