crosstools-ng: back port complib/ppl-0.11.2 with gcc 4.9 patch

This patch back ports an upstream crosstools-ng patch that fixes a
problem building ppl 0.11.2 with gcc 4.9.

See the patch for details about the issue and corrective action.

This patch fixes #104

Testing Done:

Compiled and tested toolchain using Debian stable(wheezy)  (gcc-4.7.2)
Compiled and tested toolchain using Debian testing(jessie) (gcc-4.9.1)