The `skipTestingRelaxed` check suffers the following problems:
- The use of `skipTestingRelaxed` in the `if` seems reversed: when
skipping correctness testing using the `-l` command line option, this
variable causes correctness testing to be run for relaxed-mode `tan`
regardless.
- Accuracy testing should only be skipped for derived `tan`
implementations. Non-derived `tan` implementations must still be tested
for accuracy, so the condition for setting the `skipTestingRelaxed`
variable is incomplete.
- It is unclear why only `tan` is conditionalized here. There are other
functions such as `tanpi` for which one would expect identical
behaviour.
The actual skipping of accuracy checks for derived implementations
happens in `Test()`, so just remove `skipTestingRelaxed` as it does not
seem to add any value.
Signed-off-by: Sven van Haastregt <sven.vanhaastregt@arm.com>