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

[Paul Gilbert]

ross at biostat.ucsf.edu wrote:
> 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.

The exclude features have worked for me on Linux but never on Solaris. 
Somewhere the documentation says that a tar newer than 1.13 is needed. 
This is available with versions of Linux, but is a bit of a problem on 
other systems since the latest version on ftp://ftp.gnu.org/gnu/tar/ is 
1.13.

Paul Gilbert