4.0.4:
Add README with pointers to mailing list, bugzilla & git repos
Migrate to xorg macros 1.3 & XORG_DEFAULT_OPTIONS
Replace static ChangeLog with dist-hook to generate from git log
nuke RCS Ids
Janitor: Correct make distcheck and gcc/sparse warnings.
Rename parameters to clarify QueryVersion/QueryExtension.
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.
