Hack so that lldb can find its custom readline.so, because we move it
after install.

This is based on Fedora package.

--- a/source/Interpreter/embedded_interpreter.py
+++ b/source/Interpreter/embedded_interpreter.py
@@ -1,4 +1,6 @@
 import sys
+sys.path.insert(1, '%{python_sitearch}/lldb')
+
 if sys.version_info[0] < 3:
     import __builtin__ as builtins
 else: