Deleted the s1-based egs/rm/s4 recipe

egs/rm/s4/README.txt

egs/rm/s4/conf/mfcc.conf

egs/rm/s4/conf/topo.proto

egs/rm/s4/data_prep/make_trans.pl

egs/rm/s4/data_prep/run.sh

egs/rm/s4/getdata.sh

egs/rm/s4/path.sh

egs/rm/s4/run.sh

egs/rm/s4/scripts/add_disambig.pl

egs/rm/s4/scripts/add_lex_disambig.pl

egs/rm/s4/scripts/int2sym.pl

egs/rm/s4/scripts/make_lexicon_fst.pl

egs/rm/s4/scripts/make_phones_symtab.pl

egs/rm/s4/scripts/make_rm_lm.pl

egs/rm/s4/scripts/make_roots.pl

egs/rm/s4/scripts/mkgraph.sh

egs/rm/s4/scripts/silphones.pl

egs/rm/s4/scripts/subset_scp.pl

egs/rm/s4/scripts/sym2int.pl

egs/rm/s4/steps/decode_mono.sh