Minor "make check" bug. (PR#777)

If you build R with the following sequence

./configure
make R
make check

Then "make check" fails at the following point (in examples for help()
itself)

try(help("bs", try.all.packages=FALSE)) # reports not found (an error)

Error in help("bs", try.all.packages = FALSE) :
        No documentation for `bs' in specified packages and libraries

help("bs", try.all.packages=TRUE) # reports can be found in package `splines'

Error in help("bs", try.all.packages = TRUE) :
        No documentation for `bs' in specified packages and libraries
Execution halted

Evidently this is because the help pages for the package `splines'
have not been built.  The simplest solution would be to wrap the
second call to help in a call to try.

Martyn

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