[lldb] Fix build on NetBSD (#74190)

lldb/source/Host/netbsd/HostNetBSD.cpp:112:32: error: reinterpret_cast from 'const uint8_t *' (aka 'const unsigned char *') to 'char *' casts away qualifiers
                              {reinterpret_cast<char *>(buffer_sp->GetBytes()),
                               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.