[LTP] [PATCH] close_range: check for kernel support below 5.9

[Petr Vorel]

Hi,

hm, I was too fast to merge it. Looking at older result, 
It looks like this (merged as 7b5ee03899) was not needed,
because tst_syscall() properly detects missing support:

close_range01.c:134: TINFO: Plain close range
../../../../include/lapi/close_range.h:25: TCONF: syscall(436) __NR_close_range not supported on your arch

@Edward: Before we revert it, did you encounter some problem that it's really
needed? If yes, please share details.

Kind regards,
Petr