component/slapos: Clean up extends (Minor)

component/slapos/buildout.cfg

@@ -3,23 +3,13 @@
 extends =
   ../../stack/slapos.cfg
   ../bison/buildout.cfg
-  ../bzip2/buildout.cfg
   ../firewalld/buildout.cfg
-  ../gdbm/buildout.cfg
-  ../gettext/buildout.cfg
   ../glib/buildout.cfg
-  ../libxml2/buildout.cfg
-  ../libxslt/buildout.cfg
   ../m4/buildout.cfg
-  ../ncurses/buildout.cfg
-  ../openssl/buildout.cfg
-  ../patch/buildout.cfg
   ../pkgconfig/buildout.cfg
-  ../python-2.7/buildout.cfg
   ../readline/buildout.cfg
   ../sqlite3/buildout.cfg
   ../swig/buildout.cfg
-  ../zlib/buildout.cfg
   ../socat/buildout.cfg
 
 parts =