[Bug 193931] New: [exp-run] always define *_ARGS for USES entries

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193931

            Bug ID: 193931
           Summary: [exp-run] always define *_ARGS for USES entries
           Product: Ports Tree
           Version: Latest
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Only Me
          Priority: ---
         Component: Infrastructure
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: tijl at FreeBSD.org

Created attachment 147676
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=147676&action=edit
patch

The attached patch is a proposal to change the handling of USES in bsd.port.mk
such that for every u in USES u_ARGS is always defined, and, has commas
replaced with spaces.  It also loops over USES twice.  Once to define all
u_ARGS and once to include Uses/u.mk.  This makes all u_ARGS available to all
Uses/u.mk which can be used in autoreconf.mk for instance to examine
gettext_ARGS and libtool_ARGS.

The changes for _USES_POST are similar but here u_ARGS is only defined if it
isn't defined yet (it wasn't in USES), or if there are new arguments.

The patch then adjust all Uses/*.mk:
- defined(u_ARGS) becomes !empty(u_ARGS)
- eliminate helper variables like _u_ARGS=${u_ARGS:C/,/ /g}
- Some Uses/*.mk used ":" as argument separator instead of ",", but no port
uses this at the moment
- 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

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