Manpages of libdebuginfod-dev in Debian buster-backports

• debuginfod_add_http_header(3)
• debuginfod_begin(3)
• debuginfod_end(3)
• debuginfod_find_debuginfo(3)
• debuginfod_find_executable(3)
• debuginfod_find_source(3)
• debuginfod_get_url(3)
• debuginfod_get_user_data(3)
• debuginfod_set_progressfn(3)
• debuginfod_set_user_data(3)