std::is_pod<> was deprecated in C++20.
std::is_pod<> was deprecated in C++20.

Change-Id: I52b1b96ee49c41db201a71a58a2bb5a51d7c0e10
Reviewed-on: https://code-review.googlesource.com/c/re2/+/49590
Reviewed-by: Paul Wankadia <62d4e38bb1380f055ec4b899baa75e52af09c5f7@google.com>

google/re2,google/re2,google/re2,google/re2,google/re2