Remove or conditionalize Pascal tests

[top-sekret]

As the usage of Pascal has become a little bit low in recent years, it is no longer customary to have a Pascal compiler, if it ever had been. We have NO_JAVA_TESTS. We could also add NO_PASCAL_TESTS.

[LiquidPL]

IIRC, sandboxed compilation tests should work regardless of the host environment, so these should be fine as is. For system compilers, I think a better way of achieving this would be to detect presence of system fpc and skip tests depending on that, since I see no point in a manual way to disable tests except for when a necessary compiler isn't present on the system.

In general, we should check for:

• presence of fpc in the host system,
• presence of Java (javac/java) in the host system,
• whether sio2jail can be run in the host system (ie. whether the performance counters are exposed to the system),

and disable the respective tests accordingly, and then remove the manual test disable environment variables.