[R] R-ex folder in user-created package

[Mark Lyman]

When I run R CMD check pkg the R-ex folder containing examples is created in 
pkg.Rcheck/pkg, however, when I run R CMD build pkg or R CMD INSTALL --build 
pkg, it is not created. Should the folder and its examples be created 
manually? I am running R 2.6.2 on Windows XP.