Use different clocks for wasip1 tests

These are measured subtly differently in a browser which was surfacing
failures.

Author: alexcrichton

test/src/nanosleep.c

@@ -4,6 +4,7 @@
 #include <stdlib.h>
 #include <sys/time.h>
 #include <time.h>
+#include <wasi/version.h>
 
 #define TEST(c)                                                                \
   do {                                                                         \
@@ -12,17 +13,23 @@
       t_error("%s failed (errno = %d)\n", #c, errno);                          \
   } while (0)
 
+#ifdef __wasip1__
+#define CLOCK CLOCK_REALTIME
+#else
+#define CLOCK CLOCK_MONOTONIC
+#endif
+
 int main(void) {
   // Sleep for a total of 5ms
   long ns_to_sleep = 5E6;
 
   struct timespec start_time, end_time;
-  clock_gettime(CLOCK_MONOTONIC, &start_time);
+  clock_gettime(CLOCK, &start_time);
   struct timespec dur;
   dur.tv_sec = 0;
   dur.tv_nsec = ns_to_sleep;
   TEST(nanosleep(&dur, NULL) == 0);
-  clock_gettime(CLOCK_MONOTONIC, &end_time);
+  clock_gettime(CLOCK, &end_time);
   TEST(end_time.tv_sec - start_time.tv_sec <= 1);
 
   long nanoseconds_elapsed = (end_time.tv_sec - start_time.tv_sec) * 1E9 -

test/src/usleep.c

@@ -4,6 +4,7 @@
 #include <stdlib.h>
 #include <sys/time.h>
 #include <time.h>
+#include <wasi/version.h>
 
 #define TEST(c)                                                                \
   do {                                                                         \
@@ -12,14 +13,20 @@
       t_error("%s failed (errno = %d)\n", #c, errno);                          \
   } while (0)
 
+#ifdef __wasip1__
+#define CLOCK CLOCK_REALTIME
+#else
+#define CLOCK CLOCK_MONOTONIC
+#endif
+
 int main(void) {
   // Sleep for a total of 5ms
   long ns_to_sleep = 5E6;
 
   struct timespec start_time, end_time;
-  clock_gettime(CLOCK_MONOTONIC, &start_time);
+  clock_gettime(CLOCK, &start_time);
   TEST(usleep(ns_to_sleep / 1000) == 0);
-  clock_gettime(CLOCK_MONOTONIC, &end_time);
+  clock_gettime(CLOCK, &end_time);
   TEST(end_time.tv_sec - start_time.tv_sec <= 1);
 
   long nanoseconds_elapsed = (end_time.tv_sec - start_time.tv_sec) * 1E9 -