fuzz: some improvements and add two new fuzzers (#1881)

Remove `FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION` define from
`fuzz/Makefile.am`; it is already included by the main configure script
(when fuzzing).

Add a knob to force disabling of AESNI optimizations: this way we can
fuzz also no-aesni crypto code.

Move CRC32 algorithm into the library.

Add some fake traces to extend fuzzing coverage. Note that these traces
are hand-made (via scapy/curl) and must not be used as "proof" that the
dissectors are really able to identify this kind of traffic.

Some small updates to some dissectors:

CSGO: remove a wrong rule (never triggered, BTW). Any UDP packet starting
with "VS01" will be classified as STEAM (see steam.c around line 111).
Googling it, it seems right so.

XBOX: XBOX only analyses UDP flows while HTTP only TCP ones; therefore
that condition is false.

RTP, STUN: removed useless "break"s

Zattoo: `flow->zattoo_stage` is never set to any values greater or equal
to 5, so these checks are never true.

PPStream: `flow->l4.udp.ppstream_stage` is never read. Delete it.

TeamSpeak: we check for `flow->packet_counter == 3` just above, so the
following check `flow->packet_counter >= 3` is always false.

101 files changed, 0 insertions, 0 deletions

diff --git a/fuzz/corpus/fuzz_ds_tree/01b014b146ea485e9c28e58ec5d0f3810186a81e b/fuzz/corpus/fuzz_ds_tree/01b014b146ea485e9c28e58ec5d0f3810186a81e
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--- a/fuzz/corpus/fuzz_ds_tree/01b014b146ea485e9c28e58ec5d0f3810186a81e
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diff --git a/fuzz/corpus/fuzz_ds_tree/021f72157ffa4da59637382fd9ee14780ef6986d b/fuzz/corpus/fuzz_ds_tree/021f72157ffa4da59637382fd9ee14780ef6986d
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diff --git a/fuzz/corpus/fuzz_ds_tree/0348a0c1cd260fc706fde509c9737d02f7808757 b/fuzz/corpus/fuzz_ds_tree/0348a0c1cd260fc706fde509c9737d02f7808757
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diff --git a/fuzz/corpus/fuzz_ds_tree/03fcea60dff1be565e2a9ebccca02296fb24ced0 b/fuzz/corpus/fuzz_ds_tree/03fcea60dff1be565e2a9ebccca02296fb24ced0
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diff --git a/fuzz/corpus/fuzz_ds_tree/05deb1919325611cef82cdbb9a9cae2e079a35e7 b/fuzz/corpus/fuzz_ds_tree/05deb1919325611cef82cdbb9a9cae2e079a35e7
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