pango: disable docs on darwin for now

see https://github.com/mesonbuild/meson/issues/5202

pkgs/development/libraries/pango/default.nix

@@ -17,7 +17,8 @@ in stdenv.mkDerivation rec {
     sha256 = "1lnxldmv1a12dq5h0dlq5jyzl4w75k76dp8cn360x2ijlm9w5h6j";
   };
 
-  outputs = [ "bin" "dev" "out" "devdoc" ];
+  # FIXME: docs fail on darwin
+  outputs = [ "bin" "dev" "out" ] ++ optional (!stdenv.isDarwin) "devdoc";
 
   nativeBuildInputs = [
     meson ninja
@@ -42,7 +43,7 @@ in stdenv.mkDerivation rec {
   ];
 
   mesonFlags = [
-    "-Denable_docs=true"
+    "-Denable_docs=${if stdenv.isDarwin then "false" else "true"}"
   ];
 
   enableParallelBuilding = true;