V0.9: remove unneeded -s flags for flex

I added these in a previous patch, but they are not needed and
generate a warning.

ivlpp/Makefile.in

@@ -61,7 +61,7 @@ ivlpp@EXEEXT@: $O
 	$(CC) $(LDFLAGS) $O -o ivlpp@EXEEXT@ @EXTRALIBS@
 
 lexor.c: lexor.lex
-	$(LEX) -s -t $< > $@
+	$(LEX) -t $< > $@
 
 install: all installdirs $(libdir)/ivl$(suffix)/ivlpp@EXEEXT@
 

vpi/Makefile.in

@@ -87,12 +87,12 @@ system.vpi: $O ../vvp/libvpi.a
 	$(CC) @shared@ -o $@ $O -L../vvp $(LDFLAGS) -lvpi $(SYSTEM_VPI_LDFLAGS)
 
 sys_readmem_lex.c: sys_readmem_lex.lex
-	$(LEX) -Preadmem -s -t $< > $@
+	$(LEX) -Preadmem -t $< > $@
 
 sdf_lexor.o: sdf_lexor.c sdf_parse.h
 
 sdf_lexor.c: sdf_lexor.lex
-	$(LEX) -Psdf -s -t $< > $@
+	$(LEX) -Psdf -t $< > $@
 
 # Build this in two steps to avoid parallel build issues (see pr3462585)
 sdf_parse.c: $(srcdir)/sdf_parse.y