Core/Misc: Fix no-pch build

src/server/collision/Maps/MapTree.cpp

@@ -157,7 +157,7 @@ namespace VMAP
     {
         float maxDist = (pos2 - pos1).magnitude();
         // return false if distance is over max float, in case of cheater teleporting to the end of the universe
-        if (maxDist == std::numeric_limits<float>::max() || !isfinite(maxDist))
+        if (maxDist == std::numeric_limits<float>::max() || !std::isfinite(maxDist))
             return false;
 
         // valid map coords should *never ever* produce float overflow, but this would produce NaNs too