Description of problem:
nroff fails when /tmp is read-only. I often need to read some man pages while
rescuing a system with read-only root filesystem :). A buffer in bash can used
instead of the temp file if /tmp is read-only.

Also, in most cases when both input and output charsets are utf-8 it's
unnecessary to invoke iconv, and a process can be saved for groff.

Version-Release number of selected component (if applicable):
groff-1.18.1.4-2

How reproducible:
always

Steps to Reproduce:
1. remount ro / 
2. man man
  
Actual results:
man fails

Expected results:
man works ok