Remove expired ports:
2017-11-20 news/brag: Tcl/Tk 8.4 is no longer maintained, please use 8.5+
2017-11-20 textproc/srilm: Tcl/Tk 8.4 is no longer maintained, please use 8.5+
2017-11-20 x11-toolkits/tk84: Tcl/Tk 8.4 is no longer maintained, please use
8.5+
2017-11-20 devel/tkinspect: Tcl/Tk 8.4 is no longer maintained, please use 8.5+
2017-11-20 games/bogged: Tcl/Tk 8.4 is no longer maintained, please use 8.5+
2017-11-20 games/ttraffic: Tcl/Tk 8.4 is no longer maintained, please use 8.5+
2017-11-20 games/ifm: Tcl/Tk 8.4 is no longer maintained, please use 8.5+
2017-11-20 games/tksol: Tcl/Tk 8.4 is no longer maintained, please use 8.5+
2017-11-20 lang/tcl84: Tcl/Tk 8.4 is no longer maintained, please use 8.5+
2017-11-20 mail/tkrat2: Tcl/Tk 8.4 is no longer maintained, please use 8.5+
2017-11-20 multimedia/dtv: Tcl/Tk 8.4 is no longer maintained, please use 8.5+
2017-11-20 net-mgmt/netwag: Tcl/Tk 8.4 is no longer maintained, please use 8.5+
Fix ports that confused the meaning of WRKDIR and WRKSRC.
PR: 204056
Submitted by: mat
Reviewed by: bapt
Sponsored by: Absolight
Differential Revision: https://reviews.freebsd.org/D2735
Rely on bsdtar to autodetermine the format of the distfiles when possible
For a while now bsdtar is able to autotermine compression and archive format.
Let's then use tar directly instead of piping to tar.
Now USE_BZIP2 and USE_XZ only set EXTRACT_SUFX to the right format