V3.0 fix ubuntu24 fedora41 builds

[mirostauder]

multiple builds failing with

src/scram.c:46:15: error: static declaration of 'strlcat' follows non-static declaration
   46 | static size_t strlcat(char* dst, const char* src, size_t siz)

also fix multiple wrong type warnings in scram.c

src/scram.c: In function 'calculate_client_proof':
src/scram.c:600:97: warning: format '%s' expects argument of type 'char *', but argument 4 has type 'int' [-Wformat=]
  600 |                         snprintf(errorBuffer, MAX_ERROR_LENGTH, "could not compute client key: %s", *errstr);