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/development/libraries/libevent/default.nix

@@ -23,10 +23,13 @@ stdenv.mkDerivation rec {
     ++ stdenv.lib.optional sslSupport "openssl"
     ;
 
+  nativeBuildInputs = []
+    ++ stdenv.lib.optional stdenv.hostPlatform.isDarwin fixDarwinDylibNames
+    ;
+
   buildInputs = []
     ++ stdenv.lib.optional sslSupport openssl
     ++ stdenv.lib.optional stdenv.isCygwin findutils
-    ++ stdenv.lib.optional stdenv.isDarwin fixDarwinDylibNames
     ;
 
   doCheck = false; # needs the net