CSubPicQueueNoThread: Remove a useless assignment.

`ppSubPic` is assigned from `pSubPic` which itself is assigned from `m_pSubPic` so there is no reason to assign it again. Even if `m_pSubPic` was changed by another thread, it must have had a good reason to do so and we should fight for the assignment.
Subpic: Correctly check for failed memory allocation.

The subtitle rendering process can be quite memory hungry and it's not really critical so we try to recover in case of failed memory allocation.
Lite builds: Fix a minor inconsistency regarding the output directory.

Lite debug builds use "mpc-hc_x??_Debug Lite" while release builds always used "mpc-hc_x??" for both normal and lite builds.
Fix: x86 and x64 versions conflicted over file associations.

4f465cf8b81f1da800b1bfc57cc48e317d24fbb5 was incomplete for Vista+.

This commit fixes #4064.
Language menu: Ensure "Language" always appears in English in menu entry.

If "Language" doesn't appear in the translated string, "(Language)" will be appended automatically.