- Copy stable/10@296371 to releng/10.3 in preparation for 10.3-RC1
builds.
- Update newvers.sh to reflect RC1.
- Update __FreeBSD_version to reflect 10.3.
- Update default pkg(8) configuration to use the quarterly branch.

Approved by: re (implicit)

MFC r283464:

Delete the duplicate of linux_to_native_clockid() function.

MFC r283463:

Do not use struct l_timespec without conversion. While here move
args->timeout handling before acquiring the futex key at FUTEX_WAIT path.

MFC r283459:

Add some clock mappings used in glibc 2.20.

MFC r271743:

Implement most of timer_{create,settime,gettime,getoverrun,delete}
for amd64/linux32. Fix the entirely bogus (untested) version from
r161310 for i386/linux using the same shared code in compat/linux.

It is unclear to me if we could support more clock mappings but
the current set allows me to successfully run commercial
32bit linux software under linuxolator on amd64.

Reviewed by: jhb
Differential Revision: D784
Sponsored by: DARPA, AFRL
Approved by: re (gjb)

Implement most of timer_{create,settime,gettime,getoverrun,delete}
for amd64/linux32. Fix the entirely bogus (untested) version from
r161310 for i386/linux using the same shared code in compat/linux.

It is unclear to me if we could support more clock mappings but
the current set allows me to successfully run commercial
32bit linux software under linuxolator on amd64.

Reviewed by: jhb
Differential Revision: D784
MFC after: 3 days
Sponsored by: DARPA, AFRL