cmake STDLIBS_HAVE_GETPASS examples

CTSRD-CHERI/cheribsd contrib/libpcap/CMakeLists.txt :914 

check_function_exists(getpass STDLIBS_HAVE_GETPASS)

CTSRD-CHERI/cheribsd contrib/libpcap/CMakeLists.txt :920 

endif(NOT STDLIBS_HAVE_GETPASS)