meson: support building fuzzers with libFuzzer

To support fuzzing via libFuzzer one has to pass a couple of compiler
options:

  - It is mandatory to enable the "fuzzer-no-link" sanitizer for
    coverage feedback.

  - It is recommended to enable at least one more sanitizer to catch
    issues, like the "address" sanitizer.

  - The fuzzing executables need to be linked with "-fsanitize=fuzzer"
    to wire up libFuzzer itself.

The first two items can already be achieved via the "-Db_sanitize="
option. But the last item cannot easily be achieved, as we can only
configure global link arguments.

Introduce a new "-Dfuzzers_link_args=" build option to plug this gap.
Add documentation so that users know how to set up libFuzzer.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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