- 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

Add a test program for popen().

nftw(): POSIX says directories causing loops should be silently skipped.

Formerly, loops caused nftw() to abort the traversal with ELOOP.

libc: Add some tests for fmtmsg().

A regression test to ensure that arc4random returns different sequences
in parent and child processes after a fork.

posix_spawn: If an error is detected in the child process, reap the zombie.

Formerly, in this case an error was returned but the pid was also returned
to the application, requiring the application to use unspecified behaviour
(the returned pid in error situations) to avoid zombies.

Now, reap the zombie and do not return the pid.

MFC after: 2 weeks

Generate some tests for sh's case command from the fnmatch tests.

I'm committing the generated files because I don't like a build dependency
for the sh(1) tests, and they are small and will not change much.

Add some tests for fnmatch(3).

MFC after: 1 week

Regression tests for fmtcheck(3).

Obtained from: NetBSD

Add regression test for soon-to-be-committed fpclassify().

Add a regression test for wordexp() and wordfree().