added new license header to missed audio source files
DSBCAPS_GLOBALFOCUS allows sound to still play when the application is in the background. Other backends do this, so why not let dsound do it too.
fixed uninitialzed audio_size variable in WaveFileWriter
Merge branch 'audio_misc'

- audio no longer stops playing when dolphin is in the background with the dsound backend
- wav audio dumps now have the correct sizes instead of an arbitrarily large size
[Android] Add an about screen that shows build revision.
Merge in JP's change to fix audio stuttering with OpenAL.
fix warning: format '%x' expects argument of type 'unsigned int*', but argument 3 has type 'u8* {aka unsigned char*}'