Fix loading renderer DLLs on Windows x86

After 'Fix floating point precision loss in renderer', Windows x86
client won't load the renderer DLLs. The problem is a 64 bit modulus.
I couldn't find any reports of this online. However, client with
built-in renderer worked with the 64 bit modulus.

Only tested with mingw-w64.

code/renderergl1/tr_shade.c

@@ -239,7 +239,12 @@ static void R_BindAnimatedImage( textureBundle_t *bundle ) {
 	if ( index < 0 ) {
 		index = 0;	// may happen with shader time offsets
 	}
-	index %= bundle->numImageAnimations;
+
+	// Windows x86 doesn't load renderer DLL with 64 bit modulus
+	//index %= bundle->numImageAnimations;
+	while ( index >= bundle->numImageAnimations ) {
+		index -= bundle->numImageAnimations;
+	}
 
 	GL_Bind( bundle->image[ index ] );
 }

code/renderergl2/tr_shade.c

@@ -87,7 +87,12 @@ static void R_BindAnimatedImageToTMU( textureBundle_t *bundle, int tmu ) {
 	if ( index < 0 ) {
 		index = 0;	// may happen with shader time offsets
 	}
-	index %= bundle->numImageAnimations;
+
+	// Windows x86 doesn't load renderer DLL with 64 bit modulus
+	//index %= bundle->numImageAnimations;
+	while ( index >= bundle->numImageAnimations ) {
+		index -= bundle->numImageAnimations;
+	}
 
 	GL_BindToTMU( bundle->image[ index ], tmu );
 }