Make contrib/coverage smarter about check file-existence edge cases

    DN=`dirname $fn`

    F=`echo $BN | sed -e 's/\.c$//;'`

    GC="${BN}.gcov"

    gcov -o $DN/src_*$F.o $fn

    # Figure out the object file names

    ONS=`echo ${DN}/src_*-${F}.o`

    ONS_WILDCARD_LITERAL="${DN}/src_*-${F}.o"

    # If the wildcard didn't expand, no files

    if [ "$ONS" != "${ONS_WILDCARD_LITERAL}" ]

    then

      for on in $ONS; do

        # We should have a gcno file

        GCNO=`echo $on | sed -e 's/\.o$/\.gcno/;'`

        if [ -e $GCNO ]

        then

          # No need to test for gcda, since gcov assumes no execution

          # if it's absent

          rm -f $GC

          gcov -o $on $fn

          if [ -e $GC ]

          then

            if [ -n $dst ]

            then

              mv $GC $dst/$GC

            fi

          else

            echo "gcov -o $on $fn didn't make a .gcov file"

          fi

        else

          echo "Couldn't find gcno file for $on"

        fi

      done

    else

      echo "No object file found matching source file $fn"

    fi

done