make hot pinking a texture hint

(it makes SDL take slow code paths and makes us do
conversions we oftne don't need to)

stepmania/src/RageTexture.cpp

@@ -22,6 +22,7 @@ void RageTextureID::Init()
 	bDither = false;
 	bStretch = false;
 	iColorDepth = TEXTUREMAN->GetTextureColorDepth();
+	bHotPinkColorKey = false;
 }
 
 bool RageTextureID::equal(const RageTextureID &rhs) const
@@ -33,6 +34,7 @@ bool RageTextureID::equal(const RageTextureID &rhs) const
 	if(iColorDepth != rhs.iColorDepth) return false;
 	if(bDither != rhs.bDither) return false;
 	if(bStretch != rhs.bStretch) return false;
+	if(bHotPinkColorKey != rhs.bHotPinkColorKey) return false;
 	return true;
 }
 

stepmania/src/RageTexture.h

@@ -29,6 +29,7 @@ struct RageTextureID
 	int iColorDepth;
 	bool bDither;
 	bool bStretch;
+	bool bHotPinkColorKey; /* #FF00FF */
 
 	/* Define an ordering so this can be used in a set<>.  This defines a partial
 	 * ordering; use equal() to see if they're equal. */