systemd: Don't propagate libcap

Instead delete the *.la files. The propagation of libcap was
apparently only necessary because there was a gratuitous -lcap in the
*.la files.

http://hydra.nixos.org/build/22182620

pkgs/os-specific/linux/systemd/default.nix

@@ -25,13 +25,11 @@ stdenv.mkDerivation rec {
     ];
 
   buildInputs =
-    [ pkgconfig intltool gperf kmod xz pam acl
+    [ pkgconfig intltool gperf libcap kmod xz pam acl
       /* cryptsetup */ libuuid m4 glib libxslt libgcrypt
       libmicrohttpd linuxHeaders kexectools
     ] ++ stdenv.lib.optionals pythonSupport [pythonPackages.python pythonPackages.lxml];
 
-  propagatedBuildInputs = [ libcap ];
-
   configureFlags =
     [ "--localstatedir=/var"
       "--sysconfdir=/etc"
@@ -150,6 +148,8 @@ stdenv.mkDerivation rec {
       done
 
       rm -rf $out/etc/rpm
+
+      rm $out/lib/*.la
     ''; # */
 
   enableParallelBuilding = true;