Put some stuff in the gfx plugins into namespaces, so that the symbols won't collide if someone decides to merge the gfx plugins into dolphin too. still more things left to do though.

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@6972 8ced0084-cf51-0410-be5f-012b33b47a6e

Source/Plugins/Plugin_VideoDX9/Src/D3DTexture.cpp

@@ -27,6 +27,9 @@
 #include <tmmintrin.h>
 #endif
 
+namespace DX9
+{
+
 namespace D3D
 {
 
@@ -412,3 +415,5 @@ void ReplaceTexture2D(LPDIRECT3DTEXTURE9 pTexture, const u8* buffer, const int w
 }
 
 }  // namespace
+
+}  // namespace DX9