python: bump to 2.7.6

Even though jumping from 2.7.3 to 2.7.6 looks like a minor version
bump, it is in fact a fairly significant one, because a good number of
changes to help cross-compilation have been merged into Python
upstream. Therefore, most of our patches are affected by this change.

In detail, this commit:

 * Renames all the patches to follow the naming convention of patches
   in Buildroot: the patch file names should not have any version
   number.

 * The patches numbered above 100, that add configuration options to
   disable certain modules of the Python standard library, are only
   renamed and slightly adapted, they didn't change that much.

 * The patches numbered below 100 are almost entirely rewritten: many
   of the cross-compilation problems that used to exist in Python
   2.7.3 no longer exist, and the number of remaining problems is
   smaller, and can be fixed with smaller patches.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/python/python-102-optional-2to3.patch

@@ -0,0 +1,85 @@
+Add an option to disable lib2to3
+
+lib2to3 is a library to convert Python 2.x code to Python 3.x. As
+such, it is probably not very useful on embedded system targets.
+
+Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
+Signed-off-by: Samuel Martin <s.martin49@gmail.com>
+
+---
+ Makefile.pre.in |   24 +++++++++++++++++-------
+ configure.in    |    6 ++++++
+ setup.py        |    5 +++--
+ 3 files changed, 26 insertions(+), 9 deletions(-)
+
+Index: b/Makefile.pre.in
+===================================================================
+--- a/Makefile.pre.in
++++ b/Makefile.pre.in
+@@ -941,7 +941,6 @@
+ 		json \
+ 		sqlite3 \
+ 		logging bsddb csv importlib wsgiref \
+-		lib2to3 lib2to3/fixes lib2to3/pgen2 \
+ 		ctypes  ctypes/macholib idlelib idlelib/Icons \
+ 		distutils distutils/command $(XMLLIBSUBDIRS) \
+ 		multiprocessing multiprocessing/dummy \
+@@ -958,8 +957,6 @@
+ 	json/tests \
+ 	sqlite3/test \
+ 	bsddb/test \
+-	lib2to3/tests \
+-	lib2to3/tests/data lib2to3/tests/data/fixers lib2to3/tests/data/fixers/myfixes \
+ 	ctypes/test \
+ 	distutils/tests \
+ 	unittest/test
+@@ -972,6 +969,14 @@
+ LIBSUBDIRS += pydoc_data
+ endif
+ 
++ifeq (@LIB2TO3@,yes)
++LIBSUBDIRS += lib2to3 lib2to3/fixes lib2to3/pgen2
++TESTSUBDIRS += 	lib2to3/tests				\
++		lib2to3/tests/data			\
++		lib2to3/tests/data/fixers		\
++		lib2to3/tests/data/fixers/myfixes
++endif
++
+ libinstall:	build_all $(srcdir)/Lib/$(PLATDIR) $(srcdir)/Modules/xxmodule.c
+ 	@for i in $(SCRIPTDIR) $(LIBDEST); \
+ 	do \
+Index: b/configure.ac
+===================================================================
+--- a/configure.ac
++++ b/configure.ac
+@@ -2625,6 +2625,12 @@
+ 	AS_HELP_STRING([--disable-test-modules], [disable test modules]),
+ 	[ TEST_MODULES="${enableval}" ], [ TEST_MODULES=yes ])
+ 
++AC_SUBST(LIB2TO3)
++
++AC_ARG_ENABLE(lib2to3,
++	AS_HELP_STRING([--disable-lib2to3], [disable lib2to3]),
++	[ LIB2TO3="${enableval}" ], [ LIB2TO3=yes ])
++
+ # Check for enable-ipv6
+ AH_TEMPLATE(ENABLE_IPV6, [Define if --enable-ipv6 is specified])
+ AC_MSG_CHECKING([if --enable-ipv6 is specified])
+Index: b/setup.py
+===================================================================
+--- a/setup.py
++++ b/setup.py
+@@ -2206,10 +2206,11 @@
+     import warnings
+     warnings.filterwarnings("ignore",category=DeprecationWarning)
+ 
+-    scripts = ['Tools/scripts/idle', 'Tools/scripts/2to3',
+-               'Lib/smtpd.py']
++    scripts = ['Tools/scripts/idle', 'Lib/smtpd.py']
+     if not '--disable-pydoc' in sysconfig.get_config_var("CONFIG_ARGS"):
+         scripts += [ 'Tools/scripts/pydoc' ]
++    if not '--disable-lib2to3' in sysconfig.get_config_var("CONFIG_ARGS"):
++        scripts += [ 'Tools/scripts/2to3' ]
+ 
+     setup(# PyPI Metadata (PEP 301)
+           name = "Python",