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:
to tech-multimedia

Log message:
Changes the path to put videodev.h. Fixes PR 40394.
And changes the path for such a purpose to ${BUILDLINK_DIR}/include.

Log message:
Add libv4l1 compatibility support, bump PKGREVISION.

Log message:
Allow building libv4l on older NetBSD systems by providing videoio.h.
Don't override user CFLAGS.
Bump revision.

Log message:
64-bit fixes for libv4l2, properly pass rpath for libv4lconvert, and
pass the correct number of args to mmap in at least one case.

Log message:
Add RCSID tags.

Log message:
libv4l is a collection of libraries which adds a thin abstraction layer on
top of video4linux2 devices. The purpose of this (thin) layer is to make it
easy for application writers to support a wide variety of devices without
having to write seperate code for different devices in the same class.