Flush socket test description

This ensures that we know what type of socket caused a timeout.

PiperOrigin-RevId: 225294255
Change-Id: I9033bd0f3791d3b5714aa08d111cf58a3014d252

test/syscalls/linux/socket_test_util.h

@@ -379,6 +379,7 @@ class SocketPairTest : public ::testing::TestWithParam<SocketPairKind> {
   SocketPairTest() {
     // gUnit uses printf, so so will we.
     printf("Testing with %s\n", GetParam().description.c_str());
+    fflush(stdout);
   }
 
   PosixErrorOr<std::unique_ptr<SocketPair>> NewSocketPair() const {