[lldb] Fix FreeBSD/NetBSD plugin build after AsCString API change (#192110)
The argument to `AsCString` was made explicit in
116b045b1e2bff462afff0dc0b06218e6074f427.
```
/home/ewilde/llvm-project/freebsd-lldb-build/lldb/source/Plugins/Process/FreeBSD/NativeProcessFreeBSD.cpp:754:48: error: too few arguments to function call, single argument 'value_if_empty' was not specified
754 | module_file_spec.GetFilename().AsCString());
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^
/home/ewilde/llvm-project/freebsd-lldb-build/lldb/include/lldb/Utility/ConstString.h:183:15: note: 'AsCString' declared here
183 | const char *AsCString(const char *value_if_empty) const {
| ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.
```
Not all use-sites were updated to pass an argument resulting in build
failures. I'm updating the errors in the FreeBSD and NetBSD plugins to
use formatv instead of expanding the C String, like what is done on
Linux, avoiding the issue entirely.
rdar://174675042
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