Bug: vbsp exits with code 0 when map has leaks

[minerkid08]

Describe the bug

As part of my puzzlemaker program I am running the compile tools to compile the map, I am using the exit code of the process to detect if it failed or not. For vbsp it returns 0 when the map compiles with a leak meaning that I dont know the compile failed until I run vvis.

To Reproduce

1. Try to compile any map with a leak
2. Get the output of vbsp

Issue Map

Any map with a leak

Expected Behavior

When a map has a leak vbsp should exit with something other than 0 to signal that it has failed to compile its part of the bsp.

Operating System

Arch linux (p2ce pano-cc branch)