openexr*: Fix statically building

pkgs/development/libraries/openexr/3.nix

···
     done
   '';
 
-  nativeBuildInputs = [
-    cmake
-  ];
+  cmakeFlags = lib.optional stdenv.hostPlatform.isStatic "-DCMAKE_SKIP_RPATH=ON";
 
-  propagatedBuildInputs = [
-    imath
-    zlib
-  ];
+  nativeBuildInputs = [ cmake ];
+  propagatedBuildInputs = [ imath zlib ];
 
   doCheck = true;
 

pkgs/development/libraries/openexr/default.nix

···
     })
   ];
 
+  cmakeFlags = lib.optional stdenv.hostPlatform.isStatic "-DCMAKE_SKIP_RPATH=ON";
+
   nativeBuildInputs = [ cmake ];
   propagatedBuildInputs = [ ilmbase zlib ];