Update to 0.10.18.

Switch from USES=libtool:keepla to USES=libtool


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@369464 35697150-7ecd-e111-bb59-0022644237b5
Change the way USES is handled:
- Loop over USES twice, once to define all *_ARGS variables and once to
  include Uses/*.mk.  This allows all Uses/*.mk to examine arguments given
  to other USES entries.
- Always define *_ARGS (possibly empty) and replace commas with spaces.

Similar for _USES_POST.

Adjust all Uses/*.mk:
- defined(u_ARGS) becomes !empty(u_ARGS)
- Eliminate helper variables like _*_ARGS=${*_ARGS:C/,/ /g}
- Some Uses/*.mk used ":" as argument separator instead of ",", but no port
  used this form
- Uses/cran.mk: remove unused variable VALID_ARGS and USES+=fortran which
  has no effect
- Uses/twisted.mk: simplify handling of the case where neither "build" nor
  "run" arguments have been specified

PR:		193931
Exp-run by:	antoine
Approved by:	portmgr (antoine)


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@369465 35697150-7ecd-e111-bb59-0022644237b5
- Convert to USES=python

With hat:	python@


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@369466 35697150-7ecd-e111-bb59-0022644237b5
- Update to patchlevel 27 which changes how functions are exported.
  This should eliminate the recent vulnerabilities, but keep the
  requirement for --import-functions/IMPORTFUNCTIONS option for now.
- Loosen the --import-functions requirement so it is not needed when running
  an interactive shell. It is already disallowed for privileged/setuid mode.
- Show an error on stderr when an imported function is ignored.


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@369467 35697150-7ecd-e111-bb59-0022644237b5