This reverts commit 6cb6d61525. This wasn't a useful thing after all.
6cb6d61525
@ -1402,9 +1402,6 @@ tsetattr(int *attr, int l)
case 9:
term.c.attr.mode |= ATTR_STRUCK;
break;
case 21:
term.c.attr.mode &= ~ATTR_BOLD;
case 22:
term.c.attr.mode &= ~(ATTR_BOLD | ATTR_FAINT);