[patch] don't check for execute bits of the liblto plugin

[Matthias Klose]

The lto plugin is installed without x bits set, but gcc-ar.c still checks for
the execute bits. There is no need to have the lto plugin to have the x bits
set, so just check that it is readable.

Ok for the trunk and the 4.7 branch?

  Matthias

        * (main): Don't check for execute bits for the plugin.

--- gcc/gcc-ar.c
+++ gcc/gcc-ar.c
@@ -70,7 +70,7 @@
                   dir_separator,
                   LTOPLUGINSONAME,
                   NULL);
-  if (access (plugin, X_OK))
+  if (access (plugin, R_OK))
     {
       fprintf (stderr, "%s: Cannot find plugin %s\n", av[0], plugin);
       exit (1);