python: -Wformat is needed by gcc 4.8

This fixes errors in packages using python( build with gcc 4.8)

|
/home/jenkins/oe/shr-core-branches/shr-core/tmp-eglibc/sysroots/qemuarm/usr/include/python2.7/modsupport.h:27:1:
error: 'PyArg_ParseTuple' is an unrecognized format function type
[-Werror=format=]
|  PyAPI_FUNC(int) PyArg_ParseTuple(PyObject *, const char *, ...)
Py_FORMAT_PARSETUPLE(PyArg_ParseTuple, 2, 3);
|  ^
| cc1: all warnings being treated as errors
| cc1: all warnings being treated as errors

(From OE-Core rev: 5745a482a85c064a1eec960aff104cf8ce588e30)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/python/python/gcc-4.8-fix-configure-Wformat.patch

@@ -0,0 +1,20 @@
+backport bug 17547 from http://hg.python.org/cpython/rev/9d50af4c482f/
+
+-Wformat is needed by gcc 4.8
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+
+Upstream-Status: Backport
+Index: Python-2.7.3/configure.in
+===================================================================
+--- Python-2.7.3.orig/configure.in	2013-06-11 02:22:04.186529212 -0700
++++ Python-2.7.3/configure.in	2013-06-13 02:17:06.324403327 -0700
+@@ -1196,7 +1196,7 @@
+ then
+   AC_MSG_CHECKING(whether gcc supports ParseTuple __format__)
+   save_CFLAGS=$CFLAGS
+-  CFLAGS="$CFLAGS -Werror"
++  CFLAGS="$CFLAGS -Werror -Wformat"
+   AC_COMPILE_IFELSE([
+     AC_LANG_PROGRAM([[void f(char*,...)__attribute((format(PyArg_ParseTuple, 1, 2)));]], [[]])
+   ],[

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

@@ -27,6 +27,7 @@ SRC_URI += "\
   file://python-2.7.3-remove-bsdb-rpath.patch \
   file://builddir.patch \
   file://python-2.7.3-CVE-2012-2135.patch \
+  file://gcc-4.8-fix-configure-Wformat.patch \
 "
 
 S = "${WORKDIR}/Python-${PV}"