plumb glibc clock_get interfaces to irt

sysdeps/nacl/nacl_syscalls.h

Index: sysdeps/nacl/nacl_syscalls.h
diff --git a/sysdeps/nacl/nacl_syscalls.h b/sysdeps/nacl/nacl_syscalls.h
index 10379e192c7a69408ff25d7b6bf4b32a66573b6c..d754849ca28d7cd42ce653b2884a109225284898 100644
--- a/sysdeps/nacl/nacl_syscalls.h
+++ b/sysdeps/nacl/nacl_syscalls.h
@@ -58,6 +58,8 @@
 #define NACL_sys_gettimeofday           40
 #define NACL_sys_clock                  41
 #define NACL_sys_nanosleep              42
+#define NACL_sys_clock_getres           43
+#define NACL_sys_clock_gettime          44
 
 /* 50-58 previously used for multimedia syscalls */
 
@@ -173,6 +175,10 @@ typedef pid_t (*TYPE_nacl_getpid) (void);
 typedef clock_t (*TYPE_nacl_clock) (void);
 typedef int (*TYPE_nacl_nanosleep) (const struct timespec *req,
                                     struct timespec *rem);
+typedef int (*TYPE_nacl_clock_getres) (clockid_t clk_id,
+                                       struct timespec *res);
+typedef int (*TYPE_nacl_clock_gettime) (clockid_t clk_id,
+                                        struct timespec *tp);
 /* Don't use __attribute__((noreturn)) on this because we want the
    wrapper to handle it if the syscall does happen to return. */
 typedef void (*TYPE_nacl_exit) (int status);