tree fe2033762e012acde1ebd3e1b14a741d03bf6be7
parent 35cb3198324854226928e63ca261f58db1512e3a
author Gilles Peskine <Gilles.Peskine@arm.com> 1707744318 +0100
committer Gilles Peskine <Gilles.Peskine@arm.com> 1707761265 +0100

Don't define pk_sign_verify in configurations where it's unused

In some configurations (e.g. ECDH but no ECDSA or RSA), the PK module is
useful but cannot perform any signatures. Then modern GCC complains:

```
../source/tests/suites/test_suite_pk.function: In function ‘test_pk_sign_verify’:
../source/tests/suites/test_suite_pk.function:1136:12: error: array subscript 0 is outside array bounds of ‘unsigned char[0]’ [-Werror=array-bounds]
../source/tests/suites/test_suite_pk.function:1094:19: note: while referencing sig’
…
```

This fixes test-ref-configs.pl with a modern GCC (specifically with
config-thread.h).

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>