USES=localbase:ldflags can be used to set LDFLAGS. Normally LDFLAGS
appears too early on the command line causing some ports to link with
their own libraries in LOCALBASE (if installed) instead of WRKSRC.
Also make use of _USES_POST so -L${LOCALBASE}/lib is added as late as
possible after anything a port Makefile might set. Use _USES_POST
instead of .include in libedit.mk and libarchive.mk so things like
'USES=libedit localbase:ldflags' work correctly.
Fix some issues with LIBS in some ports.
Switch ports that don't support LIBS to localbase:ldflags.
PR: 212987
Exp-run by: antoine
Approved by: portmgr (antoine)
Modify make describe to automatically prepend ${PORTSDIR} if the path for the
port is not absolute
Checked with poudriere, portmaster, portupgrade
PR: 203685
Exp-run by: antoine
Differential Revision: https://reviews.freebsd.org/D3866
localbase: mostly a non user one which enforce the compiler related flags to
lookup in localbase first to find libraries, designed to be used in
other USES
libarchive: to be used each time one is using libarchive from ports. It is
necessary to simplify work for porters dealing with different
versions of libarchive from base and different ways libarchive can
be linked in base (with libmd and/or libcrypto) only dealing with
one libarchive over all the ports tree is easier
libedit: enforce using libedit from ports for the same reasons as for
libarchive
Same things will happen for other base libraries which collides with ports
version later.
