attempt fix Makefile to install 32bit/64bit icon

        (merge https://trac.osgeo.org/grass/changeset/67458 from trunk)


git-svn-id: https://svn.osgeo.org/grass/grass/branches/releasebranch_7_0@67463 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/icons/Makefile

@@ -28,7 +28,7 @@ default: $(ETCICONS) $(HTMLICONS)
 	$(INSTALL_DATA) grass.svg $(ARCH_DISTDIR)/share/icons/hicolor/scalable/apps/grass70.svg
 	$(MKDIR) $(ARCH_DISTDIR)/share/appdata
 	$(INSTALL_DATA) grass.appdata.xml $(ARCH_DISTDIR)/share/appdata
-ifeq ($(filter x86_64,$(ARCH)),)
+ifeq ($(findstring x86_64,$(ARCH)),x86_64)
 	$(INSTALL_DATA) x86_64/grass.ico $(GUIDIR)/icons
 	$(INSTALL_DATA) x86_64/grass_osgeo.ico $(GUIDIR)/icons
 endif