tests: add libFuzzer based tests

LibFuzzer is in-process, coverage-guided, evolutionary fuzzing engine.

LibFuzzer is linked with the library under test, and feeds fuzzed inputs
to the library via a specific fuzzing entrypoint (aka "target
function"); the fuzzer then tracks which areas of the code are reached,
and generates mutations on the corpus of input data in order to maximize
the code coverage.

Lets use libFuzzer to fuzz blob and blobmsg parsing for the start.

Ref: https://llvm.org/docs/LibFuzzer.html
Signed-off-by: Petr Štetiar <ynezz@true.cz>

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diff --git a/tests/fuzz/corpus/71520a5c4b5ca73903216857abbad54a8002d44a b/tests/fuzz/corpus/71520a5c4b5ca73903216857abbad54a8002d44a
new file mode 100644
index 0000000..b4e009d
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+++ b/tests/fuzz/corpus/71520a5c4b5ca73903216857abbad54a8002d44a