This checkin adds a symlink to the lib directory of a framework install

of Python (on OSX), and the end result of that is that the combination of
``python-config --ldflags`` and ``python-config --libs`` refers to an actually
existing location.

I've done this in preference to changing python-config to specify
'-framework Python' for linking because that doesn't work when you have multiple
versions of python installed (because '-framework Python' will always link to
the 'Current' version of the framework, without a possibility to specify a
specific version).

Makefile.pre.in

@@ -1068,6 +1068,7 @@ frameworkinstallstructure:	$(LDLIBRARY)
 # install (which includes python-config) happy.
 frameworkinstallmaclib:
 	ln -fs "../../../$(PYTHONFRAMEWORK)" "$(DESTDIR)$(prefix)/lib/python$(VERSION)/config/libpython$(VERSION).a"
+	ln -fs "../$(PYTHONFRAMEWORK)" "$(DESTDIR)$(prefix)/lib/libpython$(VERSION).dylib"
 	cd Mac && $(MAKE) installmacsubtree DESTDIR="$(DESTDIR)"
 
 # This installs the IDE, the Launcher and other apps into /Applications