RISC-V Compatibility

[tgeek77]

This isn't really an issue since I'm sure it's not supported but just FYI, sysbench can't be compiled on RISC-V.

> make
Making all in third_party/luajit
make[1]: Entering directory '/workspace/git/sysbench/third_party/luajit'
make -C ./luajit clean
make[2]: Entering directory '/workspace/git/sysbench/third_party/luajit/luajit'
make -C src clean
make[3]: Entering directory '/workspace/git/sysbench/third_party/luajit/luajit/src'
lj_arch.h:59:2: error: #error "No support for this architecture (yet)"
   59 | #error "No support for this architecture (yet)"
      |  ^~~~~
lj_arch.h:407:2: error: #error "No target architecture defined"
  407 | #error "No target architecture defined"
      |  ^~~~~
lj_arch.h:59:2: error: #error "No support for this architecture (yet)"
   59 | #error "No support for this architecture (yet)"
      |  ^~~~~
lj_arch.h:407:2: error: #error "No target architecture defined"
  407 | #error "No target architecture defined"
      |  ^~~~~
lj_arch.h:59:2: error: #error "No support for this architecture (yet)"
   59 | #error "No support for this architecture (yet)"
      |  ^~~~~
lj_arch.h:407:2: error: #error "No target architecture defined"
  407 | #error "No target architecture defined"
      |  ^~~~~
lj_arch.h:59:2: error: #error "No support for this architecture (yet)"
   59 | #error "No support for this architecture (yet)"
      |  ^~~~~
lj_arch.h:407:2: error: #error "No target architecture defined"
  407 | #error "No target architecture defined"
      |  ^~~~~
lj_arch.h:59:2: error: #error "No support for this architecture (yet)"
   59 | #error "No support for this architecture (yet)"
      |  ^~~~~
lj_arch.h:407:2: error: #error "No target architecture defined"
  407 | #error "No target architecture defined"
      |  ^~~~~
lj_arch.h:59:2: error: #error "No support for this architecture (yet)"
   59 | #error "No support for this architecture (yet)"
      |  ^~~~~
lj_arch.h:407:2: error: #error "No target architecture defined"
  407 | #error "No target architecture defined"
      |  ^~~~~
Makefile:272: *** Unsupported target architecture.  Stop.
make[3]: Leaving directory '/workspace/git/sysbench/third_party/luajit/luajit/src'
make[2]: *** [Makefile:162: clean] Error 2
make[2]: Leaving directory '/workspace/git/sysbench/third_party/luajit/luajit'
make[1]: *** [Makefile:500: lib/libluajit-5.1.a] Error 2
make[1]: Leaving directory '/workspace/git/sysbench/third_party/luajit'
make: *** [Makefile:477: all-recursive] Error 1