Remove references to log4tango library
Following kernel decision to merge liblog4tango into libtango in 9.3.3 (#22, #30), I propose to remove references to liblog4tango from templates generated by pogo. The changes are Windows-specific. As for linux, liblog4tango is referenced from pkg-config file in source distribution. There also may be a potential change in cmake_tango.opt file, but I do not know from where this file is located.
CC @bourtemb