Allow use of in-base yacc.

Index: sim/ucsim/cmd.src/Makefile.in
--- sim/ucsim/cmd.src/Makefile.in.orig
+++ sim/ucsim/cmd.src/Makefile.in
@@ -96,13 +96,13 @@ installdirs:
 # ---------------------
 dep: Makefile.dep
 
-Makefile.dep: $(SOURCES) $(LOCAL_SOURCES) $(srcdir)/*.h cmdpars.hh cmdpars.cc
+Makefile.dep: $(SOURCES) $(LOCAL_SOURCES) $(srcdir)/*.h cmdpars.h cmdpars.cc
 	$(MAKEDEP) $(CPPFLAGS) $(SOURCES) $(LOCAL_SOURCES) >Makefile.dep
 
 -include Makefile.dep
 include $(srcdir)/clean.mk
 
-cmdlex.cc: cmdlex.l cmdpars.hh
+cmdlex.cc: cmdlex.l cmdpars.h
 
 # My rules
 # --------
@@ -116,12 +116,12 @@ $(top_builddir)/libcmd.a: $(OBJECTS) $(LOCAL_OBJECTS)
 .cc.o:
 	$(CXX) $(CXXFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c $< -o $@
 
-cmdpars.hh: cmdpars.cc
+cmdpars.h: cmdpars.cc
 
 cmdpars.cc: cmdpars.y
 	$(YACC) -d $<
 	mv y.tab.c $*.cc
-	mv y.tab.h $*.hh
+	mv y.tab.h $*.h
 
 .l.cc:
 	rm -f $@
