community/nodejs-current: disable on riscv64

Although riscv64 should be supported it fails to build, disable for now.

../deps/v8/src/codegen/riscv64/macro-assembler-riscv64.h:222:8: error: 'void v8::internal::TurboAssembler::JumpCodeObject(v8::internal::Register)' marked 'override', but does not override
  222 |   void JumpCodeObject(Register code_object) override;

https://github.com/nodejs/node/pull/37980