AudioCommon: Use emplace_back instead of push_back in GetSoundBackends()

Constructs the strings directly within the container instead of
performing a construction, then a copy.

The reasoning is that the BACKEND_* strings are const char arrays, so
the push_back code is equivalent to:

push_back(std::string(BACKEND_WHATEVER)) instead of forwarding the
arguments to a constructed instance directly in the container.

0 files changed, 0 insertions, 0 deletions