[rtsan] Fix issue when intercepted function was not execve in test (#144018)

compiler-rt/test/rtsan/fork_exec.cpp

@@ -45,7 +45,12 @@ int main() MAYBE_NONBLOCKING {
 }
 
 // CHECK-NOHALT: Intercepted call to {{.*}} `fork` {{.*}}
-// CHECK-NOHALT: Intercepted call to {{.*}} `execve` {{.*}}
+
+// We should also get some other intercepted call. On some systems this
+// is `execve`, on others, it's a lock to set up `execve`. In either
+// case, just check that we get a second intercepted call, don't sweat
+// the name.
+// CHECK-NOHALT: Intercepted call to {{.*}}
 
 // usleep checks that rtsan is still enabled in the parent process
 // See note in our interceptors file for why we don't look for `wait`