Track the sceMpeg_library version for behavior differences

If the game uses sceUtility or etc., it will get the latest version which is 0x010A on 6.60.

There may be other differences.  Apparently sceSAScore and sceATRAC3plus_Library have different versions available on the PSP as well.

Anyway, this has little practical benefit, but it (and related testing) will make it easier to make sure tests are correct.

-[Unknown]