Description:
After upgrading from vimpager-1.7.1-1-any to vimpager-1.7.2-1-any,
it no longer correctly displays any file or the standard input (when piped to),
when ran as a root.

Typical scenario:
# less any-file
E282: Cannot read from "-E"
Press ENTER or type command to continue
2 files to edit
E282: Cannot read from "--cmd"
Press ENTER or type command to continue
Vim then opens with an empty buffer, statusbar containing:
"let vimpager=1 | runtime! macros/less.vim" [New DIRECTORY]
The second buffer contains the data to be viewed, with no syntax higlighting.


Additional info:
* package version(s)
vimpager-1.7.2-1-any
vim-7.3.659-1-x86_64
vim-runtime-7.3.659-1-x86_64

* config and/or log files etc.
No custom configuration.
(The root user does NOT even have a .vimrc file.)

Steps to reproduce:
# less any-file
Interestingly, it works fine as a normal use but fails as a root.