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.
PRIME is Japanese PRedictive Input Method Editor.
PRIME predicts user's input words using the knowledge of natural language and
the history of user's operations, and reduces the cost of typing by the user.
For example, if a user wants to input "application" and types "ap" as the
beginning characters of the word, PRIME might predict some candidate words like
"apple", "application", "appointment", etc... And then the user can input
"application" easily by selecting the word from the candidate words by PRIME.
