Hotfix for division by zero exceptions in the soft graphics drivers.

Author: josch1710

src/Graphics_SoftFP.c

@@ -581,6 +581,8 @@ static void DrawSprite2D(VertexFixed* V0, VertexFixed* V1, VertexFixed* V2) {
     int delTY = (FixedMul(V2->v, IntToFixed(curTexHeight)) >> FP_SHIFT) - begTY;
 
     int width = maxX - minX, height = maxY - minY;
+    if (width == 0) width == 1;
+    if (height == 0) height == 1;
 
     int fast = delTX == width && delTY == height && 
                (begTX + delTX < curTexWidth) && 

src/Graphics_SoftGPU.c

@@ -401,6 +401,8 @@ static void DrawSprite2D(Vertex* V0, Vertex* V1, Vertex* V2) {
 	int delTY = (int)(V2->v * curTexHeight) - begTY;
 
 	int width = maxX - minX, height = maxY - minY;
+	if (width == 0) width == 1;
+	if (height == 0) height == 1;
 
 	int fast =  delTX == width && delTY == height && 
 				(begTX + delTX < curTexWidth ) && 

src/Graphics_SoftMin.c

@@ -388,6 +388,8 @@ static void DrawSprite2D(Vertex* V0, Vertex* V1, Vertex* V2) {
 	int delTY = (int)(V2->v * curTexHeight) - begTY;
 
 	int width = maxX - minX, height = maxY - minY;
+	if (width == 0) width == 1;
+	if (height == 0) height == 1;
 
 	int fast =  delTX == width && delTY == height && 
 				(begTX + delTX < curTexWidth ) &&