treewide: fixup breakage due to absolute compiler path

Some packages just can't handle them #44767.  It was tempting to try
to abstract this in some way, but I didn't do that ATM.

pkgs/applications/graphics/exrtools/default.nix

@@ -9,6 +9,11 @@ stdenv.mkDerivation rec {
     sha256 = "0jpkskqs1yjiighab4s91jy0c0qxcscwadfn94xy2mm2bx2qwp4z";
   };
 
+  preConfigure = ''
+    CC=${stdenv.cc.targetPrefix}cc
+    CXX=${stdenv.cc.targetPrefix}c++
+  '';
+
   nativeBuildInputs = [ pkgconfig ];
   buildInputs = [ stdenv openexr libpng12 libjpeg ];