Use SYS_futex for syscall

glibc defines SYS_futex and on newer 32bit CPUs like RISCV-32, arc there
is no 32bit time_t therefore define SYS_futex in terms of SYS_futex_time64

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

--- a/storage/innobase/sync/srw_lock.cc
+++ b/storage/innobase/sync/srw_lock.cc
@@ -210,6 +210,12 @@ void ssux_lock_low::wake() { WakeByAddre
 #  ifdef __linux__
 #   include <linux/futex.h>
 #   include <sys/syscall.h>
+/** Newer 32bit CPUs eg. RISCV-32 are defaulting to 64bit time_t from get go and
+ therefore do not define __NR_futex */
+#   if !defined(SYS_futex) && defined(SYS_futex_time64)
+#    define SYS_futex SYS_futex_time64
+#   endif
+
 #   define SRW_FUTEX(a,op,n) \
     syscall(SYS_futex, a, FUTEX_ ## op ## _PRIVATE, n, nullptr, nullptr, 0)
 #  elif defined __OpenBSD__
