Fix and improve how missing pkg dependencies are handled from repos.

- Use an array of strings to store the pkgdeps.
- While adding a missing pkgdep, check if it's already in the queue and
  new required version is greater, in that case replace with new one.

--HG--
extra : convert_revision : xtraeme%40gmail.com-20091129021735-5dqfucofny8slks2

bin/xbps-bin/install.c

@@ -56,20 +56,17 @@ show_missing_deps(prop_dictionary_t d, const char *pkgname)
 static int
 show_missing_dep_cb(prop_object_t obj, void *arg, bool *loop_done)
 {
-	const char *pkgname, *version;
+	const char *reqpkg;
 
         (void)arg;
         (void)loop_done;
 
-	prop_dictionary_get_cstring_nocopy(obj, "pkgname", &pkgname);
-	prop_dictionary_get_cstring_nocopy(obj, "version", &version);
-	if (pkgname && version) {
-		printf("  * Missing binary package for: %s%s\n",
-		    pkgname, version);
-		return 0;
-	}
+	reqpkg = prop_string_cstring_nocopy(obj);
+	if (reqpkg == NULL)
+		return EINVAL;
 
-	return EINVAL;
+	printf("  * Missing binary package for: %s\n", reqpkg);
+	return 0;
 }
 
 static bool