Do not set indent-line-function in text-mode

* lisp/textmodes/text-mode.el (text-mode): Do not reset
indent-line-function to its global default value of indent-relative.
* doc/lispref/modes.texi (Example Major Modes):
* etc/NEWS: Document change accordingly.
1 job for master in 40 minutes and 38 seconds (queued for 1 second)
Status Job ID Name Coverage
failed #1174


Name Stage Failure
test-all Test
Makefile:313: recipe for target 'check-doit' failed
make[2]: *** [check-doit] Error 2
make[2]: Leaving directory '/builds/emacs/emacs/test'
make[1]: *** [check-expensive] Error 2
Makefile:288: recipe for target 'check-expensive' failed
make[1]: Leaving directory '/builds/emacs/emacs/test'
Makefile:962: recipe for target 'check-expensive' failed
make: *** [check-expensive] Error 2
ERROR: Job failed: exit code 1