htpdate: add htpdate package based on AA feed

Source homepage has changed, and sources are updated to version 1.1.1
released 25 August 2015.

Patch adjtimex still applies.

Changes in version 1.1.1:

- Fixed out of bound issue and a missing null-terminated string (thanks
  to Tobias Stöckmann)

Signed-off-by: Tijs Van Buggenhout <tvbuggen@netzerk.be>

net/htpdate/patches/100-adjtimex.patch

@@ -0,0 +1,20 @@
+--- a/htpdate.c
++++ b/htpdate.c
+@@ -359,7 +359,7 @@ static int htpdate_adjtimex( double drif
+ 
+ 	/* Read current kernel frequency */
+ 	tmx.modes = 0;
+-	ntp_adjtime(&tmx);
++	adjtimex(&tmx);
+ 
+ 	/* Calculate new frequency */
+ 	freq = (long)(65536e6 * drift);
+@@ -377,7 +377,7 @@ static int htpdate_adjtimex( double drif
+ 		printlog( 1, "seteuid()" );
+ 		exit(1);
+ 	} else {
+-		return( ntp_adjtime(&tmx) );
++		return( adjtimex(&tmx) );
+ 	}
+ 
+ }