x64Emitter: make 'packed' parameter a bool
x64Emitter: remove redundant "Gen::"
Merge pull request #839 from Tilka/emitter

x64Emitter: small source-level fixes
windows: remove now-extraneous NOMINMAX and WIN32_LEAN_AND_MEAN #defines from dolphin code.

Wrap dinput.h in a header defining DIRECTINPUT_VERSION instead of repeating it multiple places.
Merge pull request #857 from shuffle2/msvc-improvements

windows: remove now-extraneous NOMINMAX and WIN32_LEAN_AND_MEAN #defines
Add headers required by XAudio2_7 to externals.

This makes all builds' audio compatible with downlevel Windows and removes
the need for developers to install the June 2010 DirectX SDK.