Update build regex to correctly parse Windows paths.

Author: c0gent

Cargo.sublime-build

@@ -1,7 +1,7 @@
 {
     "cmd": ["cargo", "build"],
     "selector": "source.rust",
-    "file_regex": "--> ([^:]+):([0-9]+):([0-9]+)$",
+    "file_regex": "[ \\t]*-->[ \\t]*(.*?):([0-9]+):([0-9]+)$",
     "syntax": "Cargo.build-language",
 
     "variants": [