[Linux] respect RRF_WIDE in Length_As_UTF8
[Linux] respect RRF_WIDE in Length_As_UTF8

This shouldn't make any difference though, as this flag is always set

zsx/r3,zsx/r3,Pointillistic/rebol-lang,zsx/r3,zsx/r3,Pointillistic/rebol-lang,Pointillistic/rebol-lang,Pointillistic/rebol-lang