ntpclient: fix compilation with newer kernels

glibc needs an extra header included.

Also cast time values to 64-bit in preparation for 64-bit time_t for
32-bit platforms.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

net/ntpclient/patches/300-siocgarp.patch

@@ -0,0 +1,12 @@
+--- a/ntpclient.c
++++ b/ntpclient.c
+@@ -42,6 +42,9 @@
+ #include <errno.h>
+ #ifdef PRECISION_SIOCGSTAMP
+ #include <sys/ioctl.h>
++#ifdef __GLIBC__
++#include <linux/sockios.h>
++#endif
+ #endif
+ #ifdef USE_OBSOLETE_GETTIMEOFDAY
+ #include <sys/time.h>