Re-Revert "Merge #101508: libraw: 0.20.0 -> 0.20.2"

This reverts commit c778945806.

I believe this is exactly what brings the staging branch into
the right shape after the last merge from master (through staging-next);
otherwise part of staging changes would be lost
(due to being already reachable from master but reverted).

pkgs/applications/graphics/graphicsmagick/default.nix

@@ -24,10 +24,10 @@ stdenv.mkDerivation rec {
   buildInputs =
     [ bzip2 freetype ghostscript graphviz libjpeg libpng libtiff libX11 libxml2
       zlib libtool libwebp
-    ]
-    ++ stdenv.lib.optional stdenv.isDarwin fixDarwinDylibNames;
+    ];
 
-  nativeBuildInputs = [ xz ];
+  nativeBuildInputs = [ xz ]
+    ++ stdenv.lib.optional stdenv.hostPlatform.isDarwin fixDarwinDylibNames;
 
   postInstall = ''
     sed -i 's/-ltiff.*'\'/\'/ $out/bin/*