package/atftp: security bump to version 0.7.2

Fixes the following security issues:

CVE-2019-11365: An issue was discovered in atftpd in atftp 0.7.1.  A remote
attacker may send a crafted packet triggering a stack-based buffer overflow
due to an insecurely implemented strncpy call.  The vulnerability is
triggered by sending an error packet of 3 bytes or fewer.  There are
multiple instances of this vulnerable strncpy pattern within the code base,
specifically within tftpd_file.c, tftp_file.c, tftpd_mtftp.c, and
tftp_mtftp.c.

CVE-2019-11366: An issue was discovered in atftpd in atftp 0.7.1.  It does
not lock the thread_list_mutex mutex before assigning the current thread
data structure.  As a result, the daemon is vulnerable to a denial of
service attack due to a NULL pointer dereference.  If thread_data is NULL
when assigned to current, and modified by another thread before a certain
tftpd_list.c check, there is a crash when dereferencing current->next.

For details, see
https://pulsesecurity.co.nz/advisories/atftpd-multiple-vulnerabilities



Patch 0001-Makefile.am-link-against-libpthread-for-atftp.patch patches
Makefile.am, so add _AUTORECONF.

CFLAGS is now correctly handled since commit f9dbb96844167f (configure.ac:
fix hard setting of CFLAGS), so drop the workaround about passing
-fgnu89-inline in CPPFLAGS.

Add a hash for the license file.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Reviewed-by: Ryan Barnett <ryan.barnett@rockwellcollins.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>