Encoding issue in vignette title check for html_vignette

[cderv]

It seems there is an issue with encoding when comparing the vignette title field with the VignetteIndexEntry (Thanks @py-b for the report!)

Try this in test.Rmd

---
title: "Données disponibles"
output: rmarkdown::html_vignette
vignette: >
  %\VignetteIndexEntry{Données disponibles}
  %\VignetteEngine{knitr::rmarkdown}
  %\VignetteEncoding{UTF-8}
---

# Something

Will give this warning at rendering.

Warning message:
The vignette title specified in \VignetteIndexEntry{} is different from the title in the YAML metadata. The former is "Données disponibles", and the latter is "Données disponibles". If that is intentional, you may set options(rmarkdown.html_vignette.check_title = FALSE) to suppress this check. 

The issue is with tools::vignetteInfo()

> tools::vignetteInfo("test.Rmd")
$file
[1] "test.Rmd"

$title
[1] "Données disponibles"

$depends
character(0)

$keywords
character(0)

$engine
[1] "knitr::rmarkdown"

We must work around this.

Session info

`xfun::session_info`

> xfun::session_info("rmarkdown")
R version 4.0.3 (2020-10-10)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 19041), RStudio 1.4.1087

Locale:
  LC_COLLATE=French_France.1252 
  LC_CTYPE=French_France.1252   
  LC_MONETARY=French_France.1252
  LC_NUMERIC=C                  
  LC_TIME=French_France.1252    

Package version:
  base64enc_0.1.3      digest_0.6.27       
  evaluate_0.14        glue_1.4.2          
  graphics_4.0.3       grDevices_4.0.3     
  highr_0.8            htmltools_0.5.0.9003
  jsonlite_1.7.1       knitr_1.30          
  magrittr_2.0.1       markdown_1.1        
  methods_4.0.3        mime_0.9            
  rlang_0.4.9          rmarkdown_2.5       
  stats_4.0.3          stringi_1.5.3       
  stringr_1.4.0        tinytex_0.27.1      
  tools_4.0.3          utils_4.0.3         
  xfun_0.19            yaml_2.2.1          

Pandoc version: 2.11.2

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