sfizz: fix build w/glibc-2.34, actually enable tests

Failing Hydra build: https://hydra.nixos.org/build/163931927

pkgs/applications/audio/sfizz/default.nix

@@ -1,6 +1,7 @@
 { lib, stdenv, fetchFromGitHub, libjack2, libsndfile, xorg, freetype
 , libxkbcommon, cairo, glib, gnome, flac, libogg, libvorbis, libopus, cmake
-, pango, pkg-config }:
+, pango, pkg-config, catch2
+}:
 
 stdenv.mkDerivation rec {
   pname = "sfizz";
@@ -40,6 +41,8 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ cmake pkg-config ];
 
   postPatch = ''
+    cp ${catch2}/include/catch2/catch.hpp tests/catch2/catch.hpp
+
     substituteInPlace plugins/editor/external/vstgui4/vstgui/lib/platform/linux/x11fileselector.cpp \
       --replace 'zenitypath = "zenity"' 'zenitypath = "${gnome.zenity}/bin/zenity"'
     substituteInPlace plugins/editor/src/editor/NativeHelpers.cpp \
@@ -48,6 +51,8 @@ stdenv.mkDerivation rec {
 
   cmakeFlags = [ "-DCMAKE_BUILD_TYPE=Release" "-DSFIZZ_TESTS=ON" ];
 
+  doCheck = true;
+
   meta = with lib; {
     homepage = "https://github.com/sfztools/sfizz";
     description = "SFZ jack client and LV2 plugin";