* buildlink bin/libnet{10,11}-config to bin/libnet-config for comvenience
(they ware renamed in pkgsrc to avoid conflict)
* remove -lnet from BUILDLINK_CPPFLAGS.libnet11.
linker flags should not be in CPPFLAGS, and it berak likage with libtool
as reported in PR 37300.
* libnet11 install just a static library, so set defaut DEPMETHOD = build
Bump PKGREVISION for libnet11 related packages (net/isic will be updated later).
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.
