ncrack fails to configure with -Werror=implicit-function-declaration

[vpa1977]

ncrack configure script misses some includes causing a configuration error when -Werror=implicit-function-declaration is enabled[1]

[1] https://launchpadlibrarian.net/724118158/buildlog_ubuntu-noble-armhf.ncrack_0.7+debian-5build2_BUILDING.txt.gz