remove legacy time32 timer[fd] syscalls from public syscall.h

this extends commit 5a105f19b5, removing
timer[fd]_settime and timer[fd]_gettime. the timerfd ones are likely
to have been used in software that started using them before it could
rely on libc exposing functions.

src/internal/syscall.h

@@ -193,6 +193,22 @@ hidden long __syscall_ret(unsigned long),
 #define SYS_sendfile SYS_sendfile64
 #endif
 
+#ifndef SYS_timer_settime
+#define SYS_timer_settime SYS_timer_settime32
+#endif
+
+#ifndef SYS_timer_gettime
+#define SYS_timer_gettime SYS_timer_gettime32
+#endif
+
+#ifndef SYS_timerfd_settime
+#define SYS_timerfd_settime SYS_timerfd_settime32
+#endif
+
+#ifndef SYS_timerfd_gettime
+#define SYS_timerfd_gettime SYS_timerfd_gettime32
+#endif
+
 #ifndef SYS_clock_settime
 #define SYS_clock_settime SYS_clock_settime32
 #endif