Julian Brost b34818d3fc Add missing #include <iostream>
Fixes the following build error:

    /home/jbrost/dev/icinga2/lib/base/stdiostream.cpp: In member function ‘virtual size_t icinga::StdioStream::Read(void*, size_t, bool)’:
    /home/jbrost/dev/icinga2/lib/base/stdiostream.cpp:28:15: error: invalid use of incomplete type ‘std::iostream’ {aka ‘class std::basic_iostream<char>’}
       28 |  m_InnerStream->read(static_cast<char *>(buffer), size);
          |               ^~
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