- 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

Don't import tree.h from the distribution - we have our own one in sys.

Add snmp_ntp/Makefile.in to the exclude list.

Don't extract the .gdbinit file from the distribution.

List some more files to be excluded from the original distribution.

Add an exclusion list that lists all the files from the original
distribution that we don't need.