Detect SSE2 support

Compilation on an older 32-bit Athlon XP chip fails with the error
"./Utils/AEUtil.h:50:12: error: '__m128i' does not name a type"
This is because the __m128i type is only available on SSE2 platforms.
Modify the preprocessor logic to detect SSE and SSE2 support separately.

The "emmintrin.h" header should only be included on SSE2 platforms as
well.
[bluray] Fix stream info/language retrieval for blurays in non-nav mode.
pvr: Only shows specific actions for current category or 'ALL'

Avoid to show unusable specific actions for the current context.
paplayer: do not hijack main thread for pre-buffering streams
Startup log: Resort XBMC info
Startup log: Add GCC version information
Startup log: Added debug/release build information
Startup log: fixes potential problems
Startup log: refactoring
Merge pull request #2992 from FernetMenta/paplayer

paplayer: do not hijack main thread for pre-buffering streams
Merge pull request #2963 from janbar/pvr_update

pvr: Only shows specific actions for current category or 'ALL'
Merge pull request #2948 from ace20022/blu_lang_fix

[bluray] Fix stream info/language retrieval for blurays in non-nav mode.
Merge pull request #1556 from Karlson2k/Startup_log_01

Resort and extend startup log information
Merge pull request #2612 from Jose123456/master

[AE] Fix for non-SSE2 platforms.
renderer: win - reset texture states on configure
DVDAudioCodecLPcm: Do not use AVCODEC_MAX_AUDIO_FRAME_SIZE which has been removed from FFmpeg 2.0 and dynamically allocate buffers as needed.
DVDAudioCodecPcm: Do not use AVCODEC_MAX_AUDIO_FRAME_SIZE since it is gone in FFmpeg 2.0 and dynamically allocate buffers as needed.
DVDAudioCodec(L)Pcm: Disable copying of the class.
Merge pull request #3006 from aballier/ffmpeg2

Stop using AVCODEC_MAX_AUDIO_FRAME_SIZE in (L)Pcm decoders.
DVDCodecs.h: Do not include avcodec.h directly.

If at all it should include lib/DllAvCodec.h but this does not seem to be needed here.