- 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 spinconsole from pc98, some parts seem to be missed and it's
too late (early?) to figure out what exactly.

Reported by: TAKAHASHI Yoshihiro

Add new loader console type: "spinconsole". This console selects the
video console which doesn't take any input from keyboard and hides
all output replacing it with ``spinning'' character (useful for
embedded products and custom installations).

Sponsored by: Sippy Software, Inc.

MFi386: Add support for preloading ELF relocatable object format modules.

Use __FBSDID().
Also some minor style cleanups.

Fix to build pc98 boot loader after support amd64.