at: bring back package

* import from oldpackages
* version bump, update hash
* add PKG_LICENSE and PKG_LICENSE_FILES
* update patches

Signed-off-by: Phil Eichinger <phil@zankapfel.net>

utils/at/patches/110-getloadavg.patch

@@ -0,0 +1,14 @@
+--- a/getloadavg.c
++++ b/getloadavg.c
+@@ -69,8 +69,9 @@ Boston, MA  02110-1301  USA */
+ #include <config.h>
+ #endif
+ 
+-#include "lisp.h"
+-#include "sysfile.h" /* for encapsulated open, close, read, write */
++#include <sys/types.h>
++#include <sys/stat.h>
++#include <fcntl.h>
+ 
+ #ifndef HAVE_GETLOADAVG
+