Fix errors in Makefile.in
Actually I cannot understand why this could happen.

--- nvi-1.79.old/build/Makefile.in  1996-10-23 22:43:38.000000000 +0900
+++ nvi-1.79.new/build/Makefile.in      2015-09-05 23:55:22.340436768 +0900
@@ -139,8 +139,8 @@
            cd $(datadir)/vi/catalog && $(chmod) $(fmode) *)
 	@echo "Installing Perl scripts: $(datadir)/vi/perl ..."
 	$(mkdir) $(datadir)/vi/perl && $(chmod) $(dmode) $(datadir)/vi/perl
-	[ -f VI.pm ] && $(cp) VI.pm $(datadir)/vi/perl && \
-	    cd $(datadir)/vi/perl && $(chmod) $(fmode) VI.pm)
+	-[ -f VI.pm ] && $(cp) VI.pm $(datadir)/vi/perl && \
+	    cd $(datadir)/vi/perl && $(chmod) $(fmode) VI.pm
 	(cd $(srcdir)/perl_scripts && $(cp) *.pl $(datadir)/vi/perl && \
 	    cd $(datadir)/vi/perl && $(chmod) $(fmode) *.pl)
 	@echo "Installing Tcl scripts: $(datadir)/vi/tcl ..."