stepmania: fix build with system zlib

+3
+3
pkgs/by-name/st/stepmania/package.nix
··· 17 17 libvorbis, 18 18 udev, 19 19 xorg, 20 + zlib, 20 21 }: 21 22 22 23 stdenv.mkDerivation { ··· 61 62 libvorbis 62 63 udev 63 64 xorg.libXtst 65 + zlib 64 66 ]; 65 67 66 68 cmakeFlags = [ 67 69 "-DWITH_SYSTEM_FFMPEG=1" 68 70 "-DWITH_SYSTEM_PNG=on" 71 + "-DWITH_SYSTEM_ZLIB=on" 69 72 "-DGTK2_GDKCONFIG_INCLUDE_DIR=${gtk2.out}/lib/gtk-2.0/include" 70 73 "-DGTK2_GLIBCONFIG_INCLUDE_DIR=${glib.out}/lib/glib-2.0/include" 71 74 ];