Buildbot: move lib step before blender.git step

This is an attempt to make it so revision from git
SHA is being displayed, not from libs svn revision.

build_files/buildbot/master.cfg

@@ -133,12 +133,13 @@ def generic_builder(id, libdir='', branch='', rsync=False):
     unpack_script = 'master_unpack.py'
 
     f = BuildFactory()
+    if libdir != '':
+        f.addStep(lib_svn_step(libdir))
+
     for submodule in ('blender-translations', 'blender-addons', 'blender-addons-contrib', 'scons'):
         f.addStep(git_submodule_step(submodule))
     f.addStep(git_step(branch))
     f.addStep(git_submodules_update())
-    if libdir != '':
-        f.addStep(lib_svn_step(libdir))
 
     f.addStep(Compile(command=['python', compile_script, id], timeout=3600))
     f.addStep(Test(command=['python', test_script, id]))