Update to 1.0.6:

This minor maintenance release provides a collection of build configuration
improvements and janitorial cleanups.

Alan Coopersmith (10):
      Move Pixel typedef from xwd.c to wsutils.h
      Optionally enable existing code to call XkbStdBell from libxkbfile
      Fix gcc warnings about discarding const qualifiers
      Add printf attributes as suggested by gcc -Wmissing-format-attribute
      Rename new_list variable to not shadow new_list function
      Remove unused bitmap_unit variable from ReadRegionsInList()
      Quiet gcc warnings about potentially uninitialized variables
      Fix some clang warnings about integer size/sign conversions
      Strip trailing whitespace
      xwd 1.0.6

(wiz)