- Copy stable/10 (r259064) to releng/10.0 as part of the
10.0-RELEASE cycle.
- Update __FreeBSD_version [1]
- Set branch name to -RC1

[1] 10.0-CURRENT __FreeBSD_version value ended at '55', so
start releng/10.0 at '100' so the branch is started with
a value ending in zero.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Remove stray tabs.

Submitted by: kib
Approved by: kib (mentor)
MFC after: 1 week

Allow commands without any additional arguments, as stated in the
manpage. While here, exit early when there is nothing to do.

PR: 168415
Submitted by: Zhihao Yuan (initial version)
MFC after: 1 week
Approved by: kib (mentor)

WARNS is now default to 6.

Remove end of line whitespace.

Always define LD_32_PRELOAD so it works for 32 bits binaries on
64 bits platforms. Let rtld(1) decide if it needs to honor it
or not.

While here, fix a small bug in error reporting when asprintf(3)
returns an error.

Submitted by: kib
Reviewed by: kib (mentor)
MFC after: 1 week

Use standard getopt(3) error message.

Submitted by: jilles
Approved by: kib (mentor)

Import stdbuf(1) and the shared library it relies on.
This tool changes the default buffering behaviour of standard
stdio streams.

It only works on dynamic binaries. To make it work for static
ones it would require cluttering stdio because there no single
entry point.

PR: 166660
Reviewed by: current@, jhb
Approved by: kib (mentor)
MFC after: 1 week