[Rd] Rprofile.site and check/build (PR#2872)

[laurent at cbs.dtu.dk]

Hi,

Apparently R-1.7.0 (and possibly earlier versions too) do 
not care much about what is in $R_HOME/etc/Rprofile.site
when calling 'R CMD check' or 'R CMD build'. This
is annoying when having libraries (packages) in alternative locations.

Cheers,



Laurent