Fix generation of afl-system-config.8

[bmwiedemann]

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

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

[vanhauser-thc]

I this patch incomplete?

it only contains

- test "$1" = "-h" && {
+ test "$1" = "-h" -o "$1" = "-hh" && {

[bmwiedemann]

That is correct. See the %.8 target in the top GNUmakefile that calls commands with -hh to fill the OPTIONS section

It seems ./afl-whatsup -hh could also need some improvement, but at least it prints a usage.

[vanhauser-thc]

ok.
please push to dev in the future, we do not accept PRs to stable/master.