allow getrandom syscall; from Felix von Leitner
diff --git a/sandbox-seccomp-filter.c b/sandbox-seccomp-filter.c
index 2462bcc..d132e26 100644
--- a/sandbox-seccomp-filter.c
+++ b/sandbox-seccomp-filter.c
@@ -147,6 +147,9 @@
 #ifdef __NR_getpid
 	SC_ALLOW(getpid),
 #endif
+#ifdef __NR_getrandom
+	SC_ALLOW(getrandom),
+#endif
 #ifdef __NR_gettimeofday
 	SC_ALLOW(gettimeofday),
 #endif