riscv64: Add support for riscv64
This patch adds riscv64 build support:
1, float_parse.py, float_parse_doubleprec.py are deleted, due to the float rounding fails.
2, increase release number.
Reviewed-by: Wei Fu <wefu@redhat.com>
Signed-off-by: Zhengyu He <hezhy472013@gmail.com>