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:
Fix __inline on Sun Studio.

Log message:
Update libmpcdec to 1.2.6.
While here, add DESTDIR support.

1.2.6
   * Fix an infinite loop regression from 1.2.3
   * Fix possible noise at the beginning of files

1.2.5
   * Properly increase API version since it has changed since 1.2.3
     Apps compiled with 1.2.2 WILL BREAK when used with 1.2.3 & 1.2.4 libs \ 
installed

Log message:
import libmpcdec-1.2.4, a decoder for Musepack (mpeg-plus) audio files