python: enable pip installation of pip on the host-side

Python packs some pip installation script during the build,
which looks like a better idea to use for the python-pip
and/or python-setuptools packages.

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>

lang/python/Makefile

@@ -191,6 +191,7 @@ HOST_CONFIGURE_ARGS+= \
 	--without-pymalloc \
 	--with-threads \
 	--prefix=$(STAGING_DIR_HOST) \
+	--with-ensurepip=upgrade \
 	CONFIG_SITE= \
 	OPT="$(HOST_CFLAGS)"