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-107-optional-codecs-cjk.patch

@@ -0,0 +1,25 @@
+Add an option to disable CJK codecs
+
+Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
+
+---
+ configure.in |    6 ++++++
+ 1 file changed, 6 insertions(+)
+
+Index: b/configure.ac
+===================================================================
+--- a/configure.ac
++++ b/configure.ac
+@@ -2630,6 +2630,12 @@
+    DISABLED_EXTENSIONS="${DISABLED_EXTENSIONS} _sqlite3"
+ fi
+ 
++AC_ARG_ENABLE(codecs-cjk,
++	AS_HELP_STRING([--disable-codecs-cjk], [disable CJK codecs]),
++	[ if test "$enableval" = "no"; then
++    	     DISABLED_EXTENSIONS="${DISABLED_EXTENSIONS} _codecs_kr _codecs_jp _codecs_cn _codecs_tw _codecs_hk"
++  	  fi])
++
+ AC_SUBST(TK)
+ AC_ARG_ENABLE(tk,
+ 	AS_HELP_STRING([--disable-tk], [disable tk]),