Added the qrduino benchmark

    * configure: Regenerated
    * configure.ac: Added the qrduino benchmark
    * src/qrduino/Makefile.am: Makefile for qrduino
    * src/qrduino/Makefile.in: Generated
    * src/qrduino/ecctable.h: qrduino library code
    * src/qrduino/qrbits.h: qrduino library code
    * src/qrduino/qrencode.c: qrduino library code
    * src/qrduino/qrencode.h: qrduino library code
    * src/qrduino/qrframe.c: qrduino library code
    * src/qrduino/qrtest.c: qrduino test code
Fix expint so that it does not get compiled away with optimizations

    * src/expint/expint.c: Make the return value volatile so it does not
        get optimized away
Fix compilation of trio benchmarks on AVR

    * src/trio-snprintf/trio.c: Remove references to mblen
    * src/trio-snprintf/triostr.h: Remove dependency on time.h
    * src/trio-sscanf/trio.c: Remove references to mblen
    * src/trio-sscanf/triostr.h: Remove dependency on time.h