riscv64 syscall stub and seccomp filter generation.

These are sufficiently intertwined that they need to be done together.
riscv64 is our first primary-only architecture, so that required some
changes. The .bp changes are to support this --- we need to only show
the python scripts the architectures they'll actually be using, rather
than showing them everything and ignoring some of the results.

riscv64 is also the first architecture that post-dates the kernel's
64-bit time work, so there's a bit of extra fiddling needed to handle
the __NR3264_ indirection in the uapi headers.

Signed-off-by: Mao Han <han_mao@linux.alibaba.com>
Signed-off-by: Xia Lifang <lifang_xia@linux.alibaba.com>
Signed-off-by: Chen Guoyin <chenguoyin.cgy@linux.alibaba.com>
Signed-off-by: Wang Chen <wangchen20@iscas.ac.cn>
Signed-off-by: Lu Xufan <luxufan@iscas.ac.cn>
Test: local builds for x86-64 and riscv64
Change-Id: I74044744e80b312088f805c44fbd667c9bfcdc69
diff --git a/libc/seccomp/seccomp_bpfs.h b/libc/seccomp/seccomp_bpfs.h
index 3bdffa9..34219e2 100644
--- a/libc/seccomp/seccomp_bpfs.h
+++ b/libc/seccomp/seccomp_bpfs.h
@@ -33,6 +33,13 @@
 extern const struct sock_filter arm64_system_filter[];
 extern const size_t arm64_system_filter_size;
 
+extern const struct sock_filter riscv64_app_filter[];
+extern const size_t riscv64_app_filter_size;
+extern const struct sock_filter riscv64_app_zygote_filter[];
+extern const size_t riscv64_app_zygote_filter_size;
+extern const struct sock_filter riscv64_system_filter[];
+extern const size_t riscv64_system_filter_size;
+
 extern const struct sock_filter x86_app_filter[];
 extern const size_t x86_app_filter_size;
 extern const struct sock_filter x86_app_zygote_filter[];