fix double words in comments
feedback and ok jmc@ miod, ok millert@

Save and restore the relevant FPU state on armv7.

ok deraadt@

Add XOR cookies for lr and sp. Stop saving/restoring r12 to/from the jmpbuf.
Switch from calling obsolete sig{block,setmask} to directly using the
sigprocmask syscall.

ok deraadt@ kettenis@

Grammar, typos

Late spring cleaning of the arm code for old dusty bits we do not want to
keep:
- remove bootconfig parameter passing feature (unused).
- unifdef __PROG32 and remove all remains of arm26 code.
- remo

Late spring cleaning of the arm code for old dusty bits we do not want to
keep:
- remove bootconfig parameter passing feature (unused).
- unifdef __PROG32 and remove all remains of arm26 code.
- remove ARMFPE support (unused).
- remove support for ARM2, ARM2AS, ARM3, ARM6, ARM7, ARM7TDMI and StrongARM
processor families, and the related silicon bug workarounds (especially
the SA-110 STM^ bug).
- remove cpu_functions no longer necessary after previous removals.
- remove ARM32_DISABLE_ALIGNMENT_FAULTS option (unused).
- make FIQ support conditional on option FIQ (unused, but may be eventually).

Discussed with drahn@ and jasper@ long ago, I was sitting on this commit for
no good reason.

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Arm port, NetBSD codebase stripped down, 32bit only support.