ci.freebsd.org: powerpcspe build failing due to linker error in assembly code

[Justin Hibbits]

On Mon, 20 May 2019 17:54:12 -0700
Enji Cooper <yaneurabeya at gmail.com> wrote:

> Hi,
> 	The following build issue has been cropping up over the past
> 6 hours. From
> https://ci.freebsd.org/job/FreeBSD-head-powerpcspe-build/11154/console :
> 
> 12:49:01 /usr/src/stand/powerpc/kboot/kerneltramp.S: Assembler
> messages: 12:49:01 /usr/src/stand/powerpc/kboot/kerneltramp.S:88:
> Error: Unrecognized opcode: `rldicr'
> 12:49:01 /usr/src/stand/powerpc/kboot/kerneltramp.S:96: Error:
> Unrecognized opcode: `rfid'
> 
> 	This code hasn’t changed for some time. I’m not sure what
> triggered the issue, but I suspect it has to deal with an external
> [toolchain] change. Cheers! -Enji

It's probably r348005's fault.  It removes the ppc64bridge option.
kboot should only be built for powerpc64 anyway.

- Justin