Hosts without CONFIG_NUMA_BALANCING unsupported

[leoluk]

When running on a kernel without CONFIG_NUMA_BALANCING, this warning becomes fatal:

firedancer/src/app/fdctl/configure/sysctl.c

Lines 56 to 60 in 0db931e

	{
	"/proc/sys/kernel/numa_balancing",
	0,
	WARN_EXACT,
	}

ERR     08-01 15:08:17.230085 54546  f0   main src/app/fdctl/utility.c(151): system might not support configuring sysctl, fopen failed `/proc/sys/kernel/numa_balancing` (2-ENOENT-no such file or directory)

(on 0db931e)