Fix infinite hang in emscripten_futex_wait

This bug was introduced in emscripten-core#26471.

This PR is based on emscripten-core#26586.  Thanks @stephenduong1004!

Author: stephenduong1004

system/lib/pthread/emscripten_futex_wait.c

@@ -224,7 +224,7 @@ int emscripten_futex_wait(volatile void *addr, uint32_t val, double max_wait_ms)
     }
     // If remainder_ns is negative it means we want wait forever, and we don't
     // need to decrement remainder_ns in that case.
-    if (wakeup_interval && remainder_ns > 0) {
+    if (wakeup_interval && remainder_ns >= 0) {
       remainder_ns -= wakeup_interval;
       if (remainder_ns <= 0) {
         break;

test/core/pthread/emscripten_futexes.c

@@ -14,6 +14,10 @@ int main() {
   rc = emscripten_futex_wait(&futex_value, futex_value, 1);
   assert(rc == -ETIMEDOUT);
 
+  // As should this.
+  rc = emscripten_futex_wait(&futex_value, futex_value, 0);
+  assert(rc == -ETIMEDOUT);
+
   // Check that this thread has removed itself from the wait queue.
   rc = emscripten_futex_wake(&futex_value, INT_MAX);
   assert(rc == 0);