Add nano-specs linker option to HiFive1_GCC demo.

[freertos] / FreeRTOS / Demo / RISC-V_RV32_SiFive_HiFive1_GCC / freedom-metal / gloss / sys_close.c

#include <errno.h>

int
_close(int file)
{
  errno = ENOSYS;
  return -1;
}