root-toolfile: add new toolfile root_dictcache

root_dictcache sets CMSSW_DICTDB_PATH to a package with dictionary
build information used by modified genreflex.

Signed-off-by: David Abdurachmanov <davidlt@cern.ch>
root: apply genreflex patch

Signed-off-by: David Abdurachmanov <davidlt@cern.ch>