[tx] ignore subr recursion limit

[josh-hadley]

Description

This PR updates t2cstr which handles various tx -cff duties. Previously, when dumping a font whose CFF table exceeded subroutine (or gsubr) recursion limits, tx would emit an error message and generate a zero-length file. This update still prints a message, but clarifies that it is ignoring the condition (as is the case for several other out-of-bounds font values) and continues the dump of the out-of-bounds data. It also updates the formatting of the message slightly.

Fixes #1482

Checklist:

• I have followed the Contribution Guidelines
• I have added test code and data to prove that my code functions correctly I haven't done this because the only test data I have available is a private font which cannot be added to this open source repo.
• I have verified that new and existing tests pass locally with my changes
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation

[kaydeearts]

👍

[miguelsousa]

Should this line get removed?

afdko/c/shared/include/t2cerr.h

Line 23 in 5783516

CTL_DCL_ERR(t2cErrSubrDepth, "subr recursion level limit exceeded")

[josh-hadley]

Should this line get removed?

Yes, nothing references that now. Done in 82c4128 . Thanks for catching that 😄