Add support for riscv32 (#95)

Signed-off-by: Khem Raj <raj.khem@gmail.com>

Author: kraj

gen/ioctl/main.c

@@ -41,6 +41,8 @@ int main(void) {
     printf("#if __mips == 64\n");
 #elif defined(__riscv) && __riscv_xlen == 64
     printf("#if defined(__riscv) && __riscv_xlen == 64\n");
+#elif defined(__riscv) && __riscv_xlen == 32
+    printf("#if defined(__riscv) && __riscv_xlen == 32\n");
 #elif defined(__s390x__)
     printf("#if defined(__s390x__)\n");
 #elif defined(__loongarch__)