Revert "fix #1691: use the grffile package only if it exists (it has …

…become a legacy package, and won't be available in future versions of TeX Live)"

This reverts commit 1f63943.

The fix is no loner necessary since the grffile package is back: rstudio/tinytex#152 (comment)

NEWS.md

@@ -7,6 +7,8 @@ rmarkdown 1.18
 
 - `rmarkdown::run(file = NULL, dir = "foo/")` failed to run Rmd files under the `foo/` directory (thanks, @jenzopr, #1703).
 
+- Reverted the fix for #1692 since it is no longer necessary (https://github.com/yihui/tinytex/issues/152#issuecomment-552796864).
+
 
 rmarkdown 1.17
 ================================================================================

inst/rmd/latex/default-1.14.tex

@@ -102,11 +102,7 @@
 \usepackage{longtable,booktabs}
 $endif$
 $if(graphics)$
-\usepackage{graphicx}
-% grffile has become a legacy package: https://ctan.org/pkg/grffile
-\IfFileExists{grffile.sty}{%
-\usepackage{grffile}
-}{}
+\usepackage{graphicx,grffile}
 \makeatletter
 \def\maxwidth{\ifdim\Gin@nat@width>\linewidth\linewidth\else\Gin@nat@width\fi}
 \def\maxheight{\ifdim\Gin@nat@height>\textheight\textheight\else\Gin@nat@height\fi}

inst/rmd/latex/default-1.15.2.tex

@@ -118,11 +118,7 @@
 \usepackage{longtable,booktabs}
 $endif$
 $if(graphics)$
-\usepackage{graphicx}
-% grffile has become a legacy package: https://ctan.org/pkg/grffile
-\IfFileExists{grffile.sty}{%
-\usepackage{grffile}
-}{}
+\usepackage{graphicx,grffile}
 \makeatletter
 \def\maxwidth{\ifdim\Gin@nat@width>\linewidth\linewidth\else\Gin@nat@width\fi}
 \def\maxheight{\ifdim\Gin@nat@height>\textheight\textheight\else\Gin@nat@height\fi}

inst/rmd/latex/default-1.17.0.2.tex

@@ -121,11 +121,7 @@
 \usepackage{longtable,booktabs}
 $endif$
 $if(graphics)$
-\usepackage{graphicx}
-% grffile has become a legacy package: https://ctan.org/pkg/grffile
-\IfFileExists{grffile.sty}{%
-\usepackage{grffile}
-}{}
+\usepackage{graphicx,grffile}
 \makeatletter
 \def\maxwidth{\ifdim\Gin@nat@width>\linewidth\linewidth\else\Gin@nat@width\fi}
 \def\maxheight{\ifdim\Gin@nat@height>\textheight\textheight\else\Gin@nat@height\fi}