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/include/ib0mutex.h
+++ b/storage/innobase/include/ib0mutex.h
@@ -150,6 +150,12 @@ private:
 #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
+
 /** Mutex implementation that used the Linux futex. */
 template <template <typename> class Policy>
 struct TTASFutexMutex {