Log message:
Simply and speed up buildlink3.mk files and processing.
This changes the buildlink3.mk files to use an include guard for the
recursive include. The use of BUILDLINK_DEPTH, BUILDLINK_DEPENDS,
BUILDLINK_PACKAGES and BUILDLINK_ORDER is handled by a single new
variable BUILDLINK_TREE. Each buildlink3.mk file adds a pair of
enter/exit marker, which can be used to reconstruct the tree and
to determine first level includes. Avoiding := for large variables
(BUILDLINK_ORDER) speeds up parse time as += has linear complexity.
The include guard reduces system time by avoiding reading files over and
over again. For complex packages this reduces both %user and %sys time to
half of the former time.

Log message:
Update to 1.1:

New in 1.1

- Make get_lb_prop_lang static and not an exported symbol
- Define is_line_breakable to alias to is_breakable
- Declare get_next_char_utf* will be changed to lb_get_next_char_utf*
- Move the declarations of get_next_char_utf* from linebreak.h to
  linebreakdef.h
- Add the function documentation comments to the header files

Log message:
Initial import of liblinebreak-1.0:

This is liblinebreak, an implementation of the line breaking
algorithm as described in Unicode 5.0.0 Standard Annex 14, Revision
19, available at http://www.unicode.org/reports/tr14/tr14-19.html