FIXED: Closes all streams after a OS.popen()

Previously, when popen was called, the 3 streams (stdin, stderr and stdourt) where never closed. This was the reason of the having an impossible number of open files.

This patch ensure all streams are closed after using them. This means that the ulimit trick is no more necessary

Tools/XcodeCapp/Jakefile

@@ -25,11 +25,14 @@ task ("build", function()
         if (majorVersion < 10 || minorVersion < 7)
         {
             colorPrint("XcodeCapp can only be built on Mac OS X 10.7+. You can download the binary here: https://www.dropbox.com/sh/gxdgm356gyb9tqc/rFNyl8hcVG", "red");
-
             OS.exit(0);
         }
     }
 
+    p.stdin.close();
+    p.stdout.close();
+    p.stderr.close();
+
     if (executableExists("xcodebuild"))
     {
         var args = "-sdk macosx -alltargets -configuration Release",