Make lldb build with Makefiles on OS X

- Adds Makefile build scripts to debug server
- Fixes a few small mistakes in the other makefiles
- Modifies generate-vers.pl slightly to also work for debugserver
- Changes the OS X, non-framework python search path from
  libdir to libdir/python2.X/site-packages where it is installed
  by the build system (also where it is installed on other operating
  systems)