Fix startup to security-relevant statically linked binaries.

Before the change they crash on startup.  Perform IREL relocations
earlier to prevent this.

csu/libc-start.c

@@ -24,6 +24,9 @@
 #include <bp-sym.h>
 
 extern void __libc_init_first (int argc, char **argv, char **envp);
+#ifndef SHARED
+extern void __libc_csu_irel (void);
+#endif
 
 extern int __libc_multiple_libcs;
 
@@ -134,6 +137,9 @@ LIBC_START_MAIN (int (*main) (int, char **, char ** MAIN_AUXVEC_DECL),
     }
 # endif
 
+  /* Performe IREL{,A} relocations.  */
+  __libc_csu_irel ();
+
   /* Initialize the thread library at least a bit since the libgcc
      functions are using thread functions if these are available and
      we need to setup errno.  */