- 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)

Fix ia64 build failures in EFI platform

The MFC of the recent EFI work to stable/10 caused build breakage
under ia64.

It was not apparent that there was EFI code outside the EFI tree as
this is not the case in HEAD, however in stable/10 there is for ia64.

This change does the following:
* Re-enables libefi for ia64 under gcc.
* Adds the ignore for unsupported pragma's when building libefi for ia64.
* Adds the missing parameter to efi_handle_lookup in the ia64 loader.

This is a direct commit as ia64 is no longer supported after 10.x

Approved by: re (marius)
Sponsored by: Multiplay

Fix clean target for sys/boot/efi

Fix clean target breakage of sys/boot/efi introduced by r294981
specifically the MFC of r294029 without the related change introduced by
r281114.

This is direct commit to stable/10 as head uses src.opts.mk.

Approved by: re (glebius)
Sponsored by: Multiplay

MFC r281169, r293724, r293796, r294029, r294041, r294058

MFC r281169 (by andrew):
Make global variabled only used in this file static

MFC r294058:
Make common boot file_loadraw name parameter const

MFC r294041:
Remove unused reg param from fdt_fixup_memory

MFC r293724:
Enable warnings in EFI boot code

MFC r293796:
Fix typo in libefi.c

MFC r294029:
Only build EFI components on supported compilers

Sponsored by: Multiplay

MFC r280950: Move the efi loaders to be under sys/boot/efi

In HEAD this was done to support UEFI on arm64. Merging to stable/10 to
facilitate the merging of later UEFI changes.

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

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

Unhook the loader subdirectory. The ia64 EFI loader is now build
under ../ia64/efi.

First approximation of an ia64 EFI loader. Not functional.