steam: fix opengl inside pressure-vessel

pkgs/build-support/build-fhs-userenv-bubblewrap/default.nix

@@ -88,6 +88,8 @@ let
     /lib32
     /usr/lib/i386-linux-gnu
     /usr/lib32
+    /run/opengl-driver/lib
+    /run/opengl-driver-32/lib
     EOF
     ldconfig &> /dev/null
   '';

pkgs/build-support/build-fhs-userenv-bubblewrap/env.nix

@@ -50,7 +50,8 @@ let
     ];
 
   ldconfig = writeShellScriptBin "ldconfig" ''
-    exec ${pkgs.glibc.bin}/bin/ldconfig -f /etc/ld.so.conf -C /etc/ld.so.cache "$@"
+    # due to a glibc bug, 64-bit ldconfig complains about patchelf'd 32-bit libraries, so we're using 32-bit ldconfig
+    exec ${pkgsi686Linux.glibc.bin}/bin/ldconfig -f /etc/ld.so.conf -C /etc/ld.so.cache "$@"
   '';
   etcProfile = writeText "profile" ''
     export PS1='${name}-chrootenv:\u@\h:\w\$ '