This patch is a basic enablement that supports riscv64 compile.
We are working on adding vector optimizations with riscv64 rvv
extensions, and will push the implementations later.
useful with a 64-bits kernel running a 32-bits userland to build 32-bits
apps.
* Normalize any host triplet into a quadruplet via config.sub.
* Move option parsing before any use of architecture information.
git-svn-id: svn://svn.videolan.org/x264/trunk@669 df754926-b1dd-0310-bc7b-ec298dee348c