toolchain/glibc: update to latest 2.26 commit

7b52c8ae05 libio: Avoid _allocate_buffer, _free_buffer function pointers [BZ #23236]

Refresh patches

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>

toolchain/glibc/patches/100-fix_cross_rpcgen.patch

@@ -38,7 +38,7 @@
 +++ b/sunrpc/rpc_main.c
 @@ -958,9 +958,10 @@ mkfile_output (struct commandline *cmd)
  	abort ();
-       temp = rindex (cmd->infile, '.');
+       temp = strrchr (cmd->infile, '.');
        cp = stpcpy (mkfilename, "Makefile.");
 -      if (temp != NULL)
 -	*((char *) stpncpy (cp, cmd->infile, temp - cmd->infile)) = '\0';