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-python/recipes-devtools/python/python-pandas_0.22.0.bb

@@ -4,5 +4,4 @@ require python-pandas.inc
 RDEPENDS_${PN} += " \
     ${PYTHON_PN}-future \
     ${PYTHON_PN}-json \
-    ${PYTHON_PN}-importlib \
 "