LibBSD | waf: Slience warnings when building with gcc-15 (!99)

[Chris Johns (@chris)]

Chris Johns commented on a discussion: https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/merge_requests/99#note_131040


I am confused by "recently". This error:

```
../../freebsd/sys/fs/nfsclient/nfs_clrpcops.c: In function 'nfsrpc_exchangeid':
../../freebsd/sys/fs/nfsclient/nfs_clrpcops.c:4747:28: error: implicit declaration of function 'rtems_version'; did you mean 'ktr_version'? [-Wimplicit-function-declaration]
 4747 |           const char* rv = rtems_version();
      |                            ^~~~~~~~~~~~~
      |                            ktr_version
```

Is form a change I made in 2021 and so is not recent?

Are you asking we make changes in FreeBSD to deal with this error:

```
../../freebsd/lib/libc/gen/feature_present.c: In function 'feature_present':
../../freebsd/lib/libc/gen/feature_present.c:56:13: error: implicit declaration of function 'asprintf'; did you mean 'asnprintf'? [-Wimplicit-function-declaration]
   56 |         if (asprintf(&mib, "kern.features.%s", feature) < 0)
      |             ^~~~~~~~
      |             asnprintf
```

?

What do you suggest happens to the `--enable-warnings` configure option? I made the decision early int he libbsd project to mask warnings because most were related to the underlying types we have and the FreeBSD code.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/merge_requests/99#note_131040
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