python3: Port python2 patches to reduce the interpreter size

Some of the python2 patches were left behind when doing the python3
package. This was because the python build system can now autodetect
what packages can be built in the system.

However, some of these patches are actually useful to reduce drastically
the size of the interpreter.

This patch ports the relevant patches to the python3 package, and adds a
new patch to remove the idle3 IDE as well from the interpreter.

Fixes #5696

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/python3/python3-108-optional-nis.patch

@@ -0,0 +1,28 @@
+Add an option to disable NIS
+
+NIS is not necessarily available in uClibc, so we need an option to
+not compile support for it.
+
+Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
+
+---
+ configure.ac |    6 ++++++
+ 1 file changed, 6 insertions(+)
+
+Index: cpython/configure.ac
+===================================================================
+--- cpython.orig/configure.ac
++++ cpython/configure.ac
+@@ -2471,6 +2471,12 @@
+ 		DISABLED_EXTENSIONS="${DISABLED_EXTENSIONS} _codecs_kr _codecs_jp _codecs_cn _codecs_tw _codecs_hk _codecs_iso2022"
+ 	fi])
+ 
++AC_ARG_ENABLE(nis,
++	AS_HELP_STRING([--disable-nis], [disable NIS]),
++	[ if test "$enableval" = "no"; then
++    	     DISABLED_EXTENSIONS="${DISABLED_EXTENSIONS} nis"
++  	  fi])
++
+ AC_SUBST(TK)
+ AC_ARG_ENABLE(tk,
+ 	AS_HELP_STRING([--disable-tk], [disable tk]),