Revision 406867

MFH: r406516

devel/cargo: update to 0.7.0 (release) and cleanup

- Compress :registry with xz(1) to save a few megabytes
- Add BOOTSTRAP option to build with already installed Cargo
- Generate distfiles with BOOTSTRAP=off for extra deps
- Require recent lang/rust to build (older versions not tested)
- Drop cargo-nightly and rust-nightly hacks. The latter is still supported
  via RUST_PORT=lang/rust-nightly in environment, make.conf, Makefile.local
- Drop MAKE_JOBS_UNSAFE, builds fine with MAKE_JOBS_NUMBER=32
- Drop _GH0 suffix from non-GitHub distfile
- Don't use OpenSSL port on 11.0-CURRENT (no RPATH in bootstrap)
- Don't install duplicate licenses under DOCSDIR
- Don't depend on lang/python2 when only lang/python27 is used
- Simplify manpage directory substitution
- Fix LICENSE_FILE when used with LICENSE_COMB != single
- Fix gen-registry target when WRKDIRPREFIX == MAKEOBJDIRPREFIX
- Cleanup gen-registry target
- Respect PREFIX != /usr/local
- Prepare CARGO_BOOT_SIG for i386 and DragonFly
- Apply minor style

PR:		205529
Approved by:	maintainer timeout (1 month)
Approved by:	ports-secteam (feld)
Differential Revision:	https://reviews.freebsd.org/D4562