[Rd] Rtools and R 4.0.0?

[Dirk Eddelbuettel]

There appears to have been some progress on this matter:

-Note that @command{g++} 4.9.x (as used for @R{} on Windows up to 3.6.x)
+Note that @command{g++} 4.9.x (as used on Windows prior to @R{} 4.0.0)

See SVN commit r78169 titled 'anticipate change in Windows toolchain', or the
mirrored git commit at 
https://github.com/wch/r-source/commit/bd674e2b76b2384169424e3d899fbfb5ac174978

Dirk

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