Move two Builder-related tests into the test/Builder/ subdirectory.

git-svn-id: http://scons.tigris.org/svn/scons/trunk@4674 fdb21ef1-2011-0410-befe-b5e4ea1792b1

diff --git a/test/BadBuilder.py b/test/Builder/errors.py
similarity index 100%
rename from test/BadBuilder.py
rename to test/Builder/errors.py

diff --git a/test/builder-wrappers.py b/test/Builder/wrapper.py
similarity index 100%
rename from test/builder-wrappers.py
rename to test/Builder/wrapper.py