Remove deprecated ${PYTHON_PN}-importlib from the RDEPENDS

The ${PYTHON_PN}-importlib package was removed as part of the migration to the
json manifest file.  The functionality is now part of core

Signed-off-by: Derek Straka <derek@asterius.io>
Signed-off-by: Armin Kuster <akuster808@gmail.com>

meta-oe/recipes-devtools/python/python-pygobject_3.22.0.bb

@@ -26,7 +26,7 @@ BBCLASSEXTEND = "native"
 
 EXTRA_OECONF = "--disable-cairo --with-python=${PYTHON}"
 
-RDEPENDS_${PN} += "python-setuptools python-importlib"
+RDEPENDS_${PN} += "python-setuptools"
 RDEPENDS_${PN}_class-native = ""
 
 do_install_append() {