lttng-tools: 2.11.0 -> 2.13.0; clarify license

Also enable parallel building; tested at -j48.

pkgs/development/tools/misc/lttng-tools/default.nix

@@ -2,20 +2,22 @@
 
 stdenv.mkDerivation rec {
   pname = "lttng-tools";
-  version = "2.11.0";
+  version = "2.13.0";
 
   src = fetchurl {
     url = "https://lttng.org/files/lttng-tools/${pname}-${version}.tar.bz2";
-    sha256 = "1g0g7ypxvc7wd5x4d4ixmfgl9yk0lxax3ymm95hcjwxn5p497r6w";
+    sha256 = "1ri93h45q5z6l3qmg4dakm9aj0ghfmf38i63q51yjh58lzwr9j4d";
   };
 
   nativeBuildInputs = [ pkg-config ];
   buildInputs = [ popt libuuid liburcu lttng-ust libxml2 kmod ];
 
+  enableParallelBuilding = true;
+
   meta = with lib; {
     description = "Tracing tools (kernel + user space) for Linux";
     homepage = "https://lttng.org/";
-    license = licenses.lgpl21;
+    license = with licenses; [ lgpl21Only gpl2Only ];
     platforms = platforms.linux;
     maintainers = [ maintainers.bjornfor ];
   };