Pull in the NetBSD global offset table handling code. Clang 3.5 creates
relocations the linker complains about.

Obtained from:	NetBSD
MFC after:	1 Week
Set the correct architecture when targeting ARMv7

MFC after:	1 Week
Sponsored by:	ABT Systems Ltd
Use the floating-point instruction on ARMv7 as the clang 3.5 integrated
assembler doesn't allow these two instructions to use co-processor 11.

MFC after:	1 Week
Sponsored by:	ABT Systems Ltd