use current version
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Apply patch from Daniel Serpell (with minor tweaks). Also note that this speeds up code with -O3 as well, by around 2%.

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This patch series fixes (and enables by default) the compilation with
link-time-optimization (LTO).

This was tested with gcc-4.8 from https://launchpad.net/gcc-arm-embedded
and results in a 10% code size reduction when compilling with -Os.

Daniel Serpell (3):
  Include math function prototypes from the definitions.
  Remove memset function, already included as builtin by gcc.
  Compile with LTO, gives 10% smaller code.