As per @ximion, don't warn if appstream-util is not there

Author: probonopd

appimagetool.c

@@ -290,9 +290,6 @@ main (int argc, char *argv[])
     if(! no_appstream)
         if(! g_find_program_in_path ("appstreamcli"))
             g_print("WARNING: appstreamcli is missing, please install it if you want to use AppStream metadata\n");
-    if(! no_appstream)
-        if(! g_find_program_in_path ("appstream-util"))
-            g_print("WARNING: appstream-util is missing, please install it if you want to use AppStream metadata\n");
     if(! g_find_program_in_path ("gpg2"))
         g_print("WARNING: gpg2 is missing, please install it if you want to create digital signatures\n");
     if(! g_find_program_in_path ("sha256sum"))