ltris: add upstream patch to fix buld with GCC 5

LTris was failing to build with GCC 5 due to a change in semantics
regarding inline functions compared to previous GCC versions.

The issue has already been solved upstream, but a new version hasn't
been released yet.

Fixes:

  http://autobuild.buildroot.net/results/d5e/d5e832c3aa7ee7af128e2ba1835fe7d5d69d7ce8/
  http://autobuild.buildroot.net/results/e73/e7306093e0ae1a1dcb69f015b10d56e4c95e689e/
  http://autobuild.buildroot.net/results/781/781e891e8a59dab29b0ec37d43cd03107f6cce5b/


  ...

Signed-off-by: Rodrigo Rebello <rprebello@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>