use boost::placeholders::_1 instead of deprecated _1

[lucasw]

Also use default…C++, which will be 14 in noetic, 17 on newer systems which will resolve log4cxx 0.12 error:

Errors     << hector_geotiff:make /home/lucasw/base_catkin_ws/logs/hector_geotiff/build.make.003.log                                                                                                                          
In file included from /usr/include/log4cxx/log4cxx.h:45,
                 from /usr/include/log4cxx/logstring.h:28,
                 from /usr/include/log4cxx/level.h:22,
                 from /usr/include/ros/console.h:46,
                 from /home/lucasw/base_catkin_ws/src/other/hector_slam/hector_geotiff/src/geotiff_writer/geotiff_writer.cpp:30:
/usr/include/log4cxx/boost-std-configuration.h:10:18: error: ‘shared_mutex’ in namespace ‘std’ does not name a type
   10 |     typedef std::shared_mutex shared_mutex;
      |                  ^~~~~~~~~~~~
/usr/include/log4cxx/boost-std-configuration.h:10:13: note: ‘std::shared_mutex’ is only available from C++17 onwards
   10 |     typedef std::shared_mutex shared_mutex;
      |             ^~~