Small fixes to build system for calibration

    * configure.ac: Fix: correctly use variable (missing $)
    * include/support.h: Define BOARD_REPEAT_FACTOR if the header does
        not
    * src/common.mk.am: Fix: Bracket the first expression, since ||
        takes precedence over |

    * configure: Regenerated
    * src/*/Makefile.in: Regenerated