python: fix build error with Readline 6.3

Backport two patches from upstream:

use new readline function types (closes #20374)
Issue #20374: Avoid compiler warnings when compiling readline with libedit.

[YOCTO #6107]

(From OE-Core rev: a6b91ae7dec2edebc0eaea0592c42b1c455ad4d7)

Signed-off-by: Chong Lu <Chong.Lu@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/python/python_2.7.3.bb

@@ -34,6 +34,7 @@ SRC_URI += "\
   file://pypirc-secure.patch \
   file://parallel-makeinst-create-bindir.patch \
   file://python-2.7.3-CVE-2013-1752-smtplib-fix.patch \
+  file://python-fix-build-error-with-Readline-6.3.patch \
 "
 
 S = "${WORKDIR}/Python-${PV}"