make sure doc/gforth.txt is found by fixfiles

Makefile.in

@@ -809,7 +809,7 @@ install-gensources:
 install-txt:	doc
 		$(INSTALL_DATA) doc/gforth.txt $(datadir)/gforth/$(VERSION)/doc/gforth.txt
 
-install-images:
+install-images: install-txt
 		$(INSTALL_DATA) $(kernel_fi) $(libdir)/gforth/$(VERSION)
 		GFORTHD="$(DITCENGINE)$(EXT) -p $(siteforthdir)$(PATHSEP)$(siteforthdir)$(PATHSEP)$(datadir)/gforth/$(VERSION)$(PATHSEP)$(libdir)/gforth/$(VERSION) -i $(kernel_fi)" GFORTH="$(DITCENGINE)$(EXT) -p $(siteforthdir)$(PATHSEP)$(siteforthdir)$(PATHSEP)$(datadir)/gforth/$(VERSION)$(PATHSEP)$(libdir)/gforth/$(VERSION) --die-on-signal --debug-mcheck -i $(kernel_fi) $(STARTUP)" includedir=$(subst $(package),,$(includedir)) bindir=$(subst $(package),,$(bindir)) libccdir=$(libccdir) GFORTHPATH=.:"$$GFORTHPATH" GFORTHDESTDIR="$(package)" ./gforthmi gforth.fi.install $(FORTHSIZES) $(STARTUP) fixfiles.fs
 		$(INSTALL_DATA) gforth.fi.install $(libdir)/gforth/$(VERSION)/gforth.fi