[Rd] ~ files not excluded from build (PR#3071)

[ross at biostat.ucsf.edu]

My docs say files ending in ~ are excluded by default from R CMD build.
Doesn't look that way to me.  I got them with 1.6.2 and 1.7.0.
My documenation is 1.6.0 (that is, the one saying *~ is excluded).

I have no .Rbuildignore of my own.