stream_ReadLine: fix end of line detection on big-endian UTF-16

Lines would be split on non-breaking spaces (0x00A0) instead of line
feeds (0x000A).
8 jobs for master in 34 minutes and 47 seconds (queued for 9 minutes and 17 seconds)
Status Job ID Name Coverage
  Build
passed #448595
amd64 docker
nightly-debian

00:10:42

passed #448598
macos
nightly-macos

00:17:37

passed #448597
amd64 docker
nightly-snap

00:16:48

passed #448587
amd64 docker
nightly-win32

00:13:00

passed #448590
amd64 docker
nightly-win64

00:14:57

passed #448593
amd64 docker
nightly-win64-llvm

00:18:32

passed #448599
amd64 docker
pages

00:01:54

 
  Deploy
passed pages:deploy

00:00:06