Spotted by Chris Forbes: * `std::remove_if` wasn't introduced in C++20, it's been there since 98. I just can't read docs. * Also fix the lack of `list.erase()`. Bug: None. drive-by-code-reviewing-fixes. Change-Id: I456d540ba973640747d6e4cb23faec65a4a9c83d Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/43348 Kokoro-Presubmit: kokoro <noreply+kokoro@google.com> Reviewed-by: Nicolas Capens <nicolascapens@google.com> Tested-by: Ben Clayton <bclayton@google.com>
