Remove deprecated python3-enum from the RDEPENDS

The python3-enum 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/python3-netaddr_0.7.19.bb

@@ -2,6 +2,5 @@ require python-netaddr.inc
 inherit setuptools3
 
 RDEPENDS_${PN} += " \
-    ${PYTHON_PN}-enum \
     ${PYTHON_PN}-selectors \
 "