Help to bootstrap sbcl on riscv64

[Bo YU <tsu.yubo@gmail.com>]

Hi,

>From http://www.sbcl.org/platform-table.html, it seems the upstream
has supported
riscv64&32, So I want to try build sbcl package on Debian riscv64.

0. gbp pq import
1. `gbp import-orig --pristine-tar --uscan`
2. $ gbp pq rebase & gbp pq export
There is no any conflict code.
3. gbp dch...

But Now I still get:
```
Broken at SB-COLD::LOAD-OR-CLOAD-XCOMPILER. In: #<process TOP-LEVEL
0x4002d9bf80>.
 File: #P"/<<PKGBUILDDIR>>/src/cold/defun-load-or-cload-xcompiler.lisp"
(Position #5133)
>>
758.20user 6.69system 12:33.77elapsed 101%CPU (0avgtext+0avgdata
408300maxresident)k
0inputs+399432outputs (0major+3315534minor)pagefaults 0swaps
make-target-1.sh: 2: set: can't access tty; job control turned off
//entering make-target-1.sh
//building runtime system and symbol table file
make[2]: Entering directory '/<<PKGBUILDDIR>>/src/runtime'
GNUmakefile:41: genesis/Makefile.features: No such file or directory
make[2]: *** No rule to make target 'genesis/Makefile.features'.  Stop.
make[2]: Leaving directory '/<<PKGBUILDDIR>>/src/runtime'
Command exited with non-zero status 2
0.04user 0.00system 0:00.04elapsed 102%CPU (0avgtext+0avgdata 11064maxresident)k
0inputs+0outputs (0major+1656minor)pagefaults 0swaps
```
This is the same as log of 2.2.9-1[0]

There is should have bootstrap process that I don't know.
Could you give some hits here?

BR,
Bo
[0]: https://buildd.debian.org/status/fetch.php?pkg=sbcl&arch=riscv64&ver=2%3A2.2.9-1&stamp=1673100340&raw=0