rhub_check() fails with vignette

[MatthieuStigler]

This is very similar to #629 (but opening a new issue since 629 was closed).

Running rhub_check() will systematically fail on various platforms (tested so far: "linux", "windows", "macos", "atlas").

Typical message will be (link):

Running 'texi2dvi' on 'ThCointOverview.tex' failed.
Messages:
You don't have a working TeX binary (tex) installed anywhere in
your PATH, and texi2dvi cannot proceed without one. If you want to use
this script, you'll need to install TeX

or (link):

texi2dvi script/program not available, using emulation
Error: processing vignette 'tsDyn.Stex' failed with diagnostics:
pdflatex is not available
--- failed re-building ‘tsDyn.Stex’

is it possible to either add an option to skip vignettes (--no-build-vignettes? --no-vignettes?) or add some pdflatex binaries on the platforms? or am I doing something wrong here?

Thanks!