make lit builtins a package

cat.py is not being installed when lit is installed from source. So
tests that use the internal shell fail when using cat.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@343347 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/utils/lit/lit/builtin_commands/__init__.py b/utils/lit/lit/builtin_commands/__init__.py
new file mode 100644 (file)
index 0000000..e69de29