Fix generation of afl-system-config.8

Without this patch, afl-system-config.8 varied between build hosts
because it contained lines such as
 ./afl-system-config: line 30: sysctl: command not found
 ./afl-system-config: line 31: /sys/kernel/mm/transparent_hugepage/enabled: Permission denied
 It is recommended to boot the kernel with lots of security off

See https://reproducible-builds.org/ for why this matters.

This PR was done while working on reproducible builds for openSUSE.

afl-system-config

@@ -1,5 +1,5 @@
 #!/bin/sh
-test "$1" = "-h" && {
+test "$1" = "-h" -o "$1" = "-hh" && {
   echo 'afl-system-config by Marc Heuse <mh@mh-sec.de>'
   echo
   echo $0