Bugfixes to backport to MacPorts 2.4.x

[Ryan Schmidt]

If we're not imminently ready to release MacPorts 2.5, here are some bugfixes I would nominate to be merged back to the release-2.4 branch to be released as MacPorts 2.4.3.


Reinplace quietly when clearing dependency_libs in .la files
https://github.com/macports/macports-base/commit/49a0c6f5a6088b4f7ecd0137b18d10a56f30694d

Fix case-only renames with no arguments
https://github.com/macports/macports-base/commit/acc1e62d8560609652977e563734f805c41244cf

Fix incorrect portindex usage message
https://github.com/macports/macports-base/commit/1c7c8b21c42962e9761aeb97844aa91f320eee47

Remove clang-3.8 from compiler fallback list on El Capitan and older
https://github.com/macports/macports-base/commit/c4107fcd483646853321027af2e123aa0e70a1ce

Fix error when sw_vers fails
https://github.com/macports/macports-base/commit/adf078d0e0626b831463dea740bfe4f008142cda

Fix typos in manpages
https://github.com/macports/macports-base/commit/38fe236f3f830a79c39e50526a20a32b2345d6dc

Update macOS version checks
https://github.com/macports/macports-base/commit/3ba09e0620be7a8e77e1b84da03309b09d98e902

Update Xcode version checks
https://github.com/macports/macports-base/commit/5f6bd08834d4f6cab011e068f192b965993edc30

Error when port opened with nonexistent subport
https://github.com/macports/macports-base/commit/9c48520c7347a84af603ed35ed27a96a42d57838

Fix leaving orphaned Portfiles in registry
https://github.com/macports/macports-base/commit/6c8c70b370753b9015400b27afdcd303b7a0cb63

Ignore case in livecheck regexps
https://github.com/macports/macports-base/commit/0310feb5f4c3858e067e3500936f6fa099c78803

Fix typo in warning message
https://github.com/macports/macports-base/commit/677dda56cbf3fc310b96a2fc1b54ee7c85ce5375

Add /dev/{u,}random to sandbox
https://github.com/macports/macports-base/commit/c8c1565f42a60c2b9e85a204603a66052f444c43