busybox

sort: FEATURE_SORT_OPTIMIZE_MEMORY

On sorting all kernel/linux/arch/ *.[ch] files,
this reduces memory usage by 6%.

	yes | head -99999999 | sort

goes down from 1900Mb to 380 Mb.

function                                             old     new   delta
sort_main                                            862    1098    +236

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>