Portability fixes for coreutils-5.2.1

[joerg]

Hi,
attached are three patches to fix issues on DragonFly.
src/ls.c uses DTTOIFF in one place without checking whether it exists at
all. This is inconsistent with the rest of the file.
src/paste.c depends on FILE being a complete type, which breaks on
DragonFly intentionally. The patches changes it to use explicit boundary
checks for the upper limit and NULL for closed files, both are in my
opinion improvements to the current behaviour.
fpending.m4 currently doesn't include stdio.h, resulting in an unability
to detect __fpending on DragonFly.

Regards,
Joerg Sonnenberger

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