NEWS updates (building on Windows, Rtools45).

git-svn-id: https://svn.r-project.org/R/trunk@87996 00db46b3-68df-0310-9c12-caf00c1e9a41

Author: kalibera

doc/NEWS.Rd

@@ -322,6 +322,18 @@
     \itemize{
       \item Both building \R and installing packages use the C compiler
       in C23 mode.
+
+      \item R on Windows by default uses pkg-config for linking against
+      external libraries.  This makes it easier to test R and packages with
+      alternative toolchains (such as from Msys2, e.g.  testing with LLVM
+      and possibly with sanitizers). It also allows more significant Rtools
+      updates within a single R minor release.
+
+      \item The installer scripts for Windows have been tailored to
+      \I{Rtools45}, an update of the \I{Rtools44} toolchain.  It is based on
+      GCC 14.  The experimental support for 64-bit ARM (aarch64) CPUs is
+      based on LLVM 19.  R-devel is no longer maintained to be buildable
+      using \I{Rtools44} and it is advised to switch to Rtools45.
     }
   }