[PATCH 4.14 60/67] vt: change SGR 21 to follow the standards

4.14-stable review patch. If anyone has any objections, please let me know. -- From: Mike Frysinger commit 65d9982d7e523a1a8e7c9af012da0d166f72fc56 upstream. ECMA-48 [1] (aka ISO 6429) has defined SGR 21 as "doubly underlined" since at least March 1984.

[PATCH 4.14 60/67] vt: change SGR 21 to follow the standards

4.14-stable review patch. If anyone has any objections, please let me know. -- From: Mike Frysinger commit 65d9982d7e523a1a8e7c9af012da0d166f72fc56 upstream. ECMA-48 [1] (aka ISO 6429) has defined SGR 21 as "doubly underlined" since at least March 1984. The Linux kernel has