mention libdeflate for macOS

git-svn-id: https://svn.r-project.org/R/trunk@87914 00db46b3-68df-0310-9c12-caf00c1e9a41

Author: ripley

doc/manual/R-admin.texi

@@ -5170,6 +5170,13 @@ Components @code{jpeg}, @code{libpng}, @code{pkgconfig}, @code{tiff} and
 the full range of bitmapped graphics devices.  (Some builds of
 @code{tiff} may require @code{libwebp} and/or @code{openjpeg}.)
 
+@item
+Component @code{libdeflate} for faster internal (de)compression.
+
+@c @item
+@c Component @code{gettext} for @code{libintl}, an updated version of that
+@c in the @R{} sources.
+
 @item
 An X sub-system unless configuring using @option{--without-x}: see
 @uref{https://www.xquartz.org/}. @R{}'s @command{configure}