* Fix aflpp_driver compilation on MacOS

* less newline

* Add env variable SHM_FUZZ_PAGE_SIZE to tell the forkserver about the max shm input size

* fix

* PAGE_SIZE->MAP_SIZE

* fix more nits

* More cleanup

avoid duplicated code

Fix sync for restarted instances

Assume we have one main node and N secondary nodes in a parallel
fuzzing campaign. Every time the main node found a new case, the case
will be synced to all secondary nodes. Later when the main node sync,
the main node need to run the file again to see if the file is
interesting because they are "new" cases on the secondary nodes.

In other words, for one new case, the main node has to run the redundent
test N times. This is wasteful and slowed down the progress of main
node.

The wasteful issue on secondary nodes is acceptable because we can run
more secondary nodes to mitigate the inefficiency. OTOH, increasing the
number of secondary nodes slow down the main node further.

Execute ASan targets without leak checks to read AFL_MAP_SIZE

skip known case if the file is actually coming from us

Better sync