Updated pure-ftpd packages fix security vulnerabilities

Updated pure-ftpd packages fix security vulnerabilities: An issue was discovered in Pure-FTPd 1.0.49. An uninitialized pointer vulnerability has been detected in the diraliases linked list. When the *lookup_alias(const char alias) or print_aliases(void) function is called, they fail to correctly detect the end of the linked list and try to access a non-existent list member. This is related to init_aliases in diraliases.c. (CVE-2019-9274). An issue was discovered in Pure-FTPd 1.0.49. An out-of-bounds (OOB) read has been detected in the pure_strcmp function in utils.c (CVE-2019-9365). In Pure-FTPd 1.0.49, a stack exhaustion issue was discovered in the listdir function in ls.c (CVE-2019-20176).