Turns out that in my revamped TeX builder I was listing the .dvi or

Turns out that in my revamped TeX builder I was listing the .dvi or
.pdf output file as a sideeffect since it is listed as an output
file in the .fls file. This caused the message that there were two ways to
build the file.

In fixing it I have to exclude both the .dvi and .pdf target because some
test decks produce both... THat hsoudl rarely happen in practice but
It is better to handle that case.

git-svn-id: http://scons.tigris.org/svn/scons/trunk@4305 fdb21ef1-2011-0410-befe-b5e4ea1792b1