[Rd] Windows version make installer

[Erich Neuwirth]

I stumbled upon a minor problem when creating a customized installer using

make myR IMAGEDIR=xxxxx

in src/gnuwin32/installer

In IMAGEDIR i have a complete installation with many additional
directories with packages in the directory site-library.
Since the libraries are not in library, help.start, when run,
creates a file "fixedHTMLLinks" in each of the package directories.
These files are included in the installer created with make.
Since the version installed from this installer may live in a different
directories, the fixedHTMLLinks point to incorrect places after such an
install.
So it might make sense that
make myR IMAGEDIR=xxxxx
does not include all these fixedHTMLLinks in the installer.

Erich Neuwirth