Log message:
Update go112 to 1.12.7.

This fixes a nasty code-generation bug, among other things:

go1.12.6 (released 2019/06/11) includes fixes to the compiler, the linker,
the go command, and the crypto/x509, net/http, and os packages.
See the Go 1.12.6 milestone on our issue tracker for details.

go1.12.7 (released 2019/07/08) includes fixes to cgo, the compiler,
and the linker. See the Go 1.12.7 milestone on our issue tracker for details.

Log message:
Update go112 to 1.12.5.

This release includes fixes to the compiler, the linker, the go command,
the runtime, and the os package.

Same as for go111, remove the pkg/bootstrap tree from the package.

Log message:
Update go112 to 1.12.4.

go1.12.2 (released 2019/04/05) includes fixes to the compiler, the go command,
the runtime, and the doc, net, net/http/httputil, and os packages. See the Go
1.12.2 milestone on our issue tracker for details.

go1.12.3 (released 2019/04/08) was accidentally released without its intended
fix. It is identical to go1.12.2, except for its version number. The intended
fix is in go1.12.4.

go1.12.4 (released 2019/04/11) fixes an issue where using the prebuilt binary
releases on older versions of GNU/Linux led to failures when linking programs
that used cgo. Only Linux users who hit this issue need to update.

Log message:
Update go112 to 1.12.1.

go1.12.1 (released 2019/03/14) includes fixes to cgo, the compiler, the go
command, and the fmt, net/smtp, os, path/filepath, sync, and text/template
packages. See the Go 1.12.1 milestone on our issue tracker for details.

Log message:
go112: Remove empty patch (NFC)

Log message:
go112: Remove empty patch (NFC)

Log message:
go112: Sync PLIST.SunOS with reality.

Log message:
go112: paper over issues with filenames containing umlauts.

- extract using gtar (hopefully more lenient than bsdtar)
- remove the files in question in post-extract

While here, re-add a PLIST.route conditional that was accidentally removed,
breaking the build on Linux (PR pkg/54054).