Fix std::abs warning

Recent clang wants std::abs instead of plain abs

AI/VCAI/AIUtility.cpp

@@ -432,7 +432,7 @@ bool boundaryBetweenTwoPoints (int3 pos1, int3 pos2, CCallback * cbp) //determin
 		for (int y = yMin; y <= yMax; ++y)
 		{
 			int3 tile = int3(x, y, pos1.z); //use only on same level, ofc
-			if (abs(pos1.dist2d(tile) - pos2.dist2d(tile)) < 1.5)
+			if (std::abs(pos1.dist2d(tile) - pos2.dist2d(tile)) < 1.5)
 			{
 				if (!(cbp->isVisible(tile) && cbp->getTile(tile)->blocked)) //if there's invisible or unblocked tile between, it's good
 					return false;
@@ -509,4 +509,4 @@ bool compareArtifacts(const CArtifactInstance *a1, const CArtifactInstance *a2)
 		return true;
 	else
 		return art1->price > art2->price;
-}
+}

client/battle/CBattleAnimations.cpp

@@ -782,7 +782,7 @@ bool CShootingAnimation::init()
 		spi.catapultInfo.reset(new CatapultProjectileInfo(Point(spi.x, spi.y), destPos));
 
 		double animSpeed = AnimationControls::getProjectileSpeed() / 10;
-		spi.lastStep = abs((destPos.x - spi.x) / animSpeed);
+		spi.lastStep = std::abs((destPos.x - spi.x) / animSpeed);
 		spi.dx = animSpeed;
 		spi.dy = 0;
 

client/gui/SDL_Extensions.h

@@ -113,7 +113,7 @@ template<typename IntType>
 std::string makeNumberShort(IntType number, IntType maxLength = 3) //the output is a string containing at most 5 characters [4 if positive] (eg. intead 10000 it gives 10k)
 {
 	IntType max = pow(10, maxLength);
-	if (abs(number) < max)
+	if (std::abs(number) < max)
 		return boost::lexical_cast<std::string>(number);
 
 	std::string symbols = " kMGTPE";