[analyzer] Fix uniqueing compilation commands

[csordasmarton]

We are storing unique compilation actions in a map which uses the overriden
__hash__ and __eq__ methods on the BuildAction class.

For this we used the following logic:

if action.__hash__ not in uniqued_build_actions:
    uniqued_build_actions[action.__hash__] = action

In this case we didn't called the function but we checked whether the
function is in the map. Before Python 3.9 this solution somehow worked
but in later Python versions it will not unique compilation actions properly.

To solve this problem we will use the following logic:

if action not in uniqued_build_actions:
    uniqued_build_actions[action] = action

Under the hood the Python interpreter will call the overriden dunder functions.