dunfell: ensurepip not needed in rootfs

This was pulled down from the facebook/openbmc repo:
https://github.com/facebook/openbmc/blob/19cd2a3e9638e7a2652518c022e422c7de4c7259/common/recipes-devtools/python/python3_%25.bbappend

(From meta-phosphor rev: d23fed577d26eb704e427a4f65f13866cb391de1)

Change-Id: I5cb44b0e3b634bf0d605e84e3d32a15e84615354
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/meta-phosphor/recipes-devtools/python/python3_%.bbappend b/meta-phosphor/recipes-devtools/python/python3_%.bbappend
index f689a9e..5d5e38a 100644
--- a/meta-phosphor/recipes-devtools/python/python3_%.bbappend
+++ b/meta-phosphor/recipes-devtools/python/python3_%.bbappend
@@ -3,3 +3,9 @@
 ALTERNATIVE_${PN}-core += "python"
 ALTERNATIVE_LINK_NAME[python] = "${bindir}/python"
 ALTERNATIVE_TARGET[python] = "${bindir}/python3"
+
+# Even though python3 is built with --without-ensurepip, it still installs
+# a large, compressed version of pip.  Remove it to free up the space.
+do_install_append_class-target() {
+    rm -rf ${D}${libdir}/python${PYTHON_MAJMIN}/ensurepip
+}